全部

1·Water surges from the cells on the inside of the leaf to those on the outside, causing the leaf to rapidly flip in shape from convex to concave, like a soft contact lens.

水从叶子内部的细胞涌向外面的细胞，导致叶子迅速地从凸向凹翻转，就像一片柔软的隐形眼镜。

2·Just as a double convex lens enlarges so a double concave lens reduces.

正象双凸透镜可以放大那样，双凹透镜也可以缩小。

3·Objective: to observe the effect of concave and convex on growing and the refractive developing of guinea pig eyes and to establish lens-induced animal model of myopia or hyperopia.

目的：观察凹透镜和凸透镜对豚鼠眼球生长和屈光变化的影响，建立透镜诱导型屈光不正动物模型。

4·We fabricated a large computer-generated holography on a concave lens surface to test the convex secondary mirrors surface.

在凹透镜表面上制作出了用于凸非球面检测的曲面全息图。

5·Just AS a double convex lens enlarges, so a double concave lens reduces.

正象双凸透镜可以放大那样，双凹透镜也可以缩小。

6·Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.

该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；

7·Among the reshaping systems converting a Gaussian beam to a flattop beam, the system composed of a plane-concave and a plane-convex lens, is a relatively simple structure.

在将高斯光束整形为平顶光束的整形系统中，由两个非球面镜组成的系统是比较简单的结构形式，该系统由平凹镜和平凸镜组成。

8·Methods Hypermetropia and myopia were induced by playing concave and convex lens in front of eyes of 32 subjects.

方法在正常眼前放置正、负球镜，人工诱导单纯性远视、近视性屈光参差。