sub·tend /səbˈtɛnd/
(v.)對;包在葉腋內
Sub·tend v. t. [imp. & p. p. Subtended; p. pr. & vb. n. Subtending.] To extend under, or be opposed to; as, the line of a triangle which subtends the right angle; the chord subtends an arc.
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subtend
v : be opposite to; of angles and sides, in geometry [syn: delimit]