1. 用相关软件制作初步模版。如 www.canva.cn
2. 用 Google Slides 加工， 如叠加别的图片，二维码等等。
Google Slides 可以把图片 crop 成圆形或其它形状。
3. 用 Photoshop 或 GIMP 制作透明背景，方便把 logo 放别的图上。
https://itsfoss.com/remove-image-background-gimp/
一般来说，应该有黑色和白色两个版本，用于浅色背景和深色背景。黑色和白色是中性色，搭配别的颜色一般都不错。
Check file info:
<output> <output>Sound Interface
Software Mixer
电子钢琴内录
声卡
Webcam driver that uses an image or video file as the video source.
10/13/2020
9/15/2020
8/15/2020
Figure drawing
Procreate
Others
Notes below are from [5].
There are two main types of microphone: dynamic and condenser. Each has qualities that work well with recording voice tracks. When considering this aspect of your mic section, you really need to think about your recording environment. If you are recording in a professional studio then choosing a condenser is a great choice, as you will have better quality sound. However, if you are not recording in that studio, going with a dynamic will allow you to negate background noise and echo, which will improve your sound quality.
A polar pattern is a design that defines how the mic picks up sound. Though like with everything else this a personal preference, most podcasters will suggest you use cardioid pickup pattern. This mic will focus on pricing up the sound from directly in front of it while decreasing the influence of the sounds picked up from the side. There are three types of this polar pattern: cardioid, super-cardioid, and hyper-cardioid.
Most podcasters will be using a computer as their chosen recording device, so making sure that you have an easy hookup to your equipment is important. There are two main types of connection. You can go with a mic that uses a USB connection (which is the most frequently used by podcasters) or one that goes with an XLR hookup, which uses a port resembling a headphone jack to connect to your audio input source. This is good if you are working in an actual studio and not out of your home studio or office.
谈美声歌唱艺术 田玉斌 (1995)
封面：
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下面内容来自：夏威夷语
夏威夷语的发展史
1778年库克船长来到夏威夷之前，夏威夷语只是一种口头语言，是库克和他的部下第一次把夏威夷语记录下来，而且他们很快就意识到夏威夷语和之前见过的毛利人和塔希提人的语言很相似。
传教士来到夏威夷之后，他们需要把口语形式的夏威夷语转换成一种书面语，然后教会夏威夷人读懂书面语，这样做的目的是传播圣经。
传教士发明了夏威夷语字母，总共是12个字母，后来又增加了两个标点符号：奥金那（okina）和卡汉库（kahako）。
夏威夷语一瞥
夏威夷语的字母表中共有十二个字母——五个元音字母和七个辅音字母。此外还有奥金那（okina）和卡汉库（kahako），它们是能改变单词发音的标点符号。
夏威夷语的字母是：A, E, I, O, U, H, K, L, M, N, P, W。
元音字母的读音和英语的不同：
A 读作"ah"
E 读作"eh"
I 读作"ee"
O 读作"oh"
U 读作"oo"
一般地，夏威夷语里的"W"读起来像英语的"V"。
辅音遇到元音时，会和元音一起发音，如，"H"和元音字母的组合会读作：
Ha读作"Hah"
He读作"Heh"
Hi读作"Hee"
Ho读作"Hoh"
Hu读作"Hoo"
奥金那（okina）是一个类似于撇号（'）的符号，它用来分隔音节。奥金那（okina）也叫停顿，只在两个元音之间出现。以夏威夷语为母语的人和较传统的人在说或写夏威夷语时会随时添加这个符号。奥金那（okina）虽然不一定会出现在印刷品和互联网上，但会出现在各大夏威夷语报纸和许多书中。比如，Lanai 这个单词，如果不用停顿符号的话读作"Lah-nigh"，用了停顿符号之后写成"Lana‘I"，读作"Lah-nah-ee"。另一个例子是Molokai这个单词，如果不用停顿符号的话读作"Moh-loh-kai"(kai读起来像 sky里的ky)，用了停顿符号之后写成"Moloka‘I"读作"Moh-loh-kah-ee"。虽然两种读法都是正确的，但是你要注意有时停顿符号会改变单词的意思。
卡汉库（kahako）是一个看上去像破折号（－）的符号，它标在元音字母的上面，表示这是一个长元音，要比正常读音拖长一点，这个差别很小，往往很难把握。
| C major | Completely pure. Its character is: innocence, simplicity, naïvety, children's talk. |
| C minor | Declaration of love and at the same time the lament of unhappy love. All languishing, longing, sighing of the love-sick soul lies in this key. |
| Db major | A leering key, degenerating into grief and rapture. It cannot laugh, but it can smile; it cannot howl, but it can at least grimace its crying.--Consequently only unusual characters and feelings can be brought out in this key. |
| D major | The key of triumph, of Hallejuahs, of war-cries, of victory-rejoicing. Thus, the inviting symphonies, the marches, holiday songs and heaven-rejoicing choruses are set in this key. |
| D minor | Melancholy womanliness, the spleen and humours brood. |
| D# minor | Feelings of the anxiety of the soul's deepest distress, of brooding despair, of blackest depresssion, of the most gloomy condition of the soul. Every fear, every hesitation of the shuddering heart, breathes out of horrible D# minor. If ghosts could speak, their speech would approximate this key. |
| Eb major | The key of love, of devotion, of intimate conversation with God. |
| E major | Noisy shouts of joy, laughing pleasure and not yet complete, full delight lies in E Major. |
| F major | Complaisance & calm. |
| F minor | Deep depression, funereal lament, groans of misery and longing for the grave. |
| F# major | Triumph over difficulty, free sigh of relief utered when hurdles are surmounted; echo of a soul which has fiercely struggled and finally conquered lies in all uses of this key. |
| F# minor | A gloomy key: it tugs at passion as a dog biting a dress. Resentment and discontent are its language. |
| G major | Everything rustic, idyllic and lyrical, every calm and satisfied passion, every tender gratitude for true friendship and faithful love,--in a word every gentle and peaceful emotion of the heart is correctly expressed by this key. |
| G minor | Discontent, uneasiness, worry about a failed scheme; bad-tempered gnashing of teeth; in a word: resentment and dislike. |
| Ab major | Key of the grave. Death, grave, putrefaction, judgment, eternity lie in its radius. |
| Ab minor | Grumbler, heart squeezed until it suffocates; wailing lament, difficult struggle; in a word, the color of this key is everything struggling with difficulty. |
| A major | This key includes declarations of innocent love, satisfaction with one's state of affairs; hope of seeing one's beloved again when parting; youthful cheerfulness and trust in God. |
| A minor | Pious womanliness and tenderness of character. |
| Bb major | Cheerful love, clear conscience, hope aspiration for a better world. |
| Bb minor | A quaint creature, often dressed in the garment of night. It is somewhat surly and very seldom takes on a pleasant countenance. Mocking God and the world; discontented with itself and with everything; preparation for suicide sounds in this key. |
| B major | Strongly coloured, announcing wild passions, composed from the most glaring coulors. Anger, rage, jealousy, fury, despair and every burden of the heart lies in its sphere. |
| B minor | This is as it were the key of patience, of calm awaiting ones's fate and of submission to divine dispensation. |
| C major: C minor: D major: D minor: Eb major: E major: E minor: F major: F minor: G major: G minor: A major: A minor: B major: B minor: Bb major: Bb minor: |
gay and warlike obscure and sad joyous and very warlike serious and pious cruel and hard quarrelsome and boisterous effeminate, amorous, plaintive furious and quick-tempered subjects obscure and plaintive serious and magnificent serious and magnificent joyful and pastoral tender and plaintive harsh and plaintive solitary and melancholic magnificent and joyful obscure and terrible |
| C major: Db major: E major: E minor: F major: F minor: F# major: Gb major: |
Pure, certain, decisive; expressive
of innocence, powerful resolve, manly earnestness and deep religious
feeling Fullness of tone, sonority and euphony Joy, magnificence, splendour; brightest and most powerful key Grief, mournfulness, restlessness Peace, joy, light, passing regret, religious sentiment Harrowing, melancholy Brilliant, very clear Softness, richness |