be opposite to; of angles and sides, in geometry 同义词：delimit,
例句与用法
1.
A radian is the angle subtended by an arc of a circle whose length is just equal to the radius . 一弧度就是长度刚好等于半径的一段圆弧所对的圆心角。
2.
In the daisy family the numerous bracts which subtend the inflorescence are known as an involucre 在菊科植物中，苞片数目多而聚生在花序外围，称为总苞。
3.
Each individual floret of the spikelet is also subtended by two bracts , the lower being called the lemma and the upper the palea 每一朵能发育的花的外面又有两片鳞片状的薄片包住，称为稃片，外面的一片称外稃，是花基部的苞片，里面的一片称内稃。
4.
Approaching , disparate , at relaxed walking pace they crossed both the circus before george s church diametrically , the chord in any circle being less than the arc which it subtends 他们迈着悠闲的步子先后挨近了圣乔治教堂前的圆形广场，然后迳直穿过去。说起来，任何一个圆，其弦都比弧要短。
5.
Supplier of the subject merchandises hereby undertake to indemnify you against all liability , claims , cost and expenses whatever that maybe returned or subtend by you and . or your agents by reason of the said merchandises having shown the following discrepancy 如商品出现下列问题，该商品的供货商在此保证因可能的退货或将其退给您和/或您的代理而产生的债务，索赔要求，成本和费用等对您作出赔偿。
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