subtend

verb

1. 对向（弧或角）
   to be opposite to an arc or angle

1. 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。
2. In this paper, based on the error theory, the mean square error of elevation difference median in bilateral observation of subtend trigonometric distance measure is presumed.
   应用误差理论，推算测距三角高程对向观测高差中数中误差；
3. In estimating the accuracy of subtend trigonometric leveling, a model that computes the difference of refraction coefficient and its accuracy is proposed in the paper.
   在精密测距三角高程精度估算中，提出了往返折光系数差的计算模型及其精度估算方法；
4. Accuracy Analysis of Subtend Trigonometric Leveling and Determination of Weight Matrix for Adjustment of Elevation Mixed Network
   精密测距三角高程精度分析及高程混合网定权
5. In addition, the bands of scattered light, which subtend a large angle with the crystal as its vertex, have been observed.
   同时还观察到了具有较大张角的散射带。

verb

1. be opposite to

   Synonym:    delimit