凸透镜的英文：
convex
A convex lens is used to concentrate rays of light.
凸透镜用于聚集光线。
He focused the sun's ray on a piece of paper with a burning-glass.
他用一面凸透镜把阳光在纸上聚成焦点。
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。
adj. 凸出的；凸面的
n. 凸面体；凸状
Draws a single, convex polygon.
画一个凸多边形。
There is a large convex mirror above the fireplace.
壁炉上方有一面大凸面镜。
On his map, the surface of the earth is convex.
在他的地图上，地球表面呈圆凸状。
A convex molding just below the abacus of a Doric capital.
多立斯柱头顶板下的凸出装饰。
The convexity of the seed capsule is of decisive importance in host selection
种子囊的突起对寄主的选择起着决定性的作用。