在他的地图上，地球表面呈圆凸状。

On his map, the surface of the earth is convex.

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弯月面容器中之静止液体的弯曲上表面，如果液体浸润了容器壁，那么弯曲面呈凹状；如果没有，就呈凸状。

The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls and convex if it does not.

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然后进行一系列过滤，保证凸状多边形能保持最小的狭缝宽度。

A series of filters then ensures that convex polygons with peninsulas maintain a minimum isthmus width.

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