subtend
v[Tn]
(geometry 幾) (of a chord2(1) or the side of a triangle) be opposite to (an arc(1) or angle) (指弦或三角形之邊)對向(某弧或角)
The chord AC subtends the arc ABC. The side XZ subtends the angle XYZ. AC 弦對向 ABC 弧. XZ 邊對向 XYZ 角. =>illus 見插圖.
??? 情景例句
It all sounds so easy.
一切聽起來竟是如此簡單。
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