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Tri- is a prefix meaning 'three,' used at the start of many English words — a triangle has three angles, a tricycle has three wheels, a trio is a group of three. It doesn't usually stand alone as its own word in formal writing. However, in casual sports talk, 'a tri' is commonly used as a short, informal way to say 'a triathlon' — the race that combines swimming, cycling, and running — so you might hear someone say 'I'm doing my first tri in June.'
表示「三」的字首（如 triangle）；（口語）鐵人三項（triathlon）的簡稱
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。
Triname
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A surname from Vietnamese.
trinoun/tɹaɪ/
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triathlon
- a tri bike
- a tri suit
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computer-graphicscomputingengineeringtriangle
- The most common poly budget in use for games at the time of this writing is between 5,000 and 10,000 tris. Anything within that range is sufficient to accommodate all superficial anatomical details without resort to optimization beyond normal model cleanup.
- Tris and quads have different areas of functionality. In real-time graphics, tris are the norm because they provide the most basic geometric representations of planes.
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bodybuildinghobbieslifestyletriceps
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。