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A letter of the Greek alphabet (θ). Outside of the alphabet itself, it is used a lot in math and physics as the symbol for an unknown angle, so if your students see math problems using angles, 'theta' is often just the name given to that angle, like 'x' is often used for an unknown number.
希臘字母 θ，數學中常用來代表角度
原始詞典資料7 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Thetanoun
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A member of the Kappa Alpha Theta sorority.
thetanoun/ˈθiːtə/
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The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.
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mathematicssciencesThe measure of an angle.
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aeronauticsaerospaceaviationPitch angle; the angle between an aircraft's longitudinal axis and the horizontal plane.
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businessfinanceThe sensitivity of the value of a derivative with respect to time; the "time decay".
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biologynatural-sciencesDesignating a level of brain activity as measured by electroencephalography having a frequency of between four and seven cycles per second (associated with drowsiness in adults).
- The reader is less likely to throw the book down in a fit of disgust than she is to be lulled into a theta state, a highway hypnosis induced by page after page of incantatory prose.
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human-scienceslinguisticsphonologyThe voiceless dental fricative represented by θ.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。