| 释义 | 
		subtend美 [səb'tend]  英 [səb'tend]  过去分词:subtended  现在分词:subtending  第三人称单数:subtends   1.  | ~ sth 对向(弧或角)to be opposite to an arc or angle  |  
 v.  | 1. to be opposite and delimit the extent of an angle or side of a geometric figure 2. to lie underneath something so as to surround or enclose it  |  
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