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- His figure looks very funny in the concave mirror. 他的样子在凹镜里显得非常可笑。
- An indented or concave surface or area. 凹陷，洼地凹的表面或地区
- He asked for an extension of his visa. 他申请延长签证有效期。
- He built an extension onto his house. 他给自己的住宅扩建了一部分。
- Extension of the injured arm was painful. 把受伤的胳膊伸展开是很疼的。
- By extension, an array of any number of dimensions. 广义来说，矩阵可以是任意维数的数组。
- concave extension grate area 凹板延长栅格面积
- concave extension 凹板延长板
- We built an extension to our house. 我们扩建了我家的房屋。
- Extension of validity of bid shall normally not be requested. 一般来说不应要求延长投标有效期限。
- 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。
- She has an extension in the kitchen and in the bedroom. 她的厨房和卧室都有电话分机。
- A concave molding with a cross section that approximates a quarter circle. 飞檐的凹圆线脚截面近于九十度弧的凹线脚
- A depression similar to that in a shallow concave container for food. 凹形，凹面与浅的凹型盛食物的容器相似的凹处
- The palm of one's hand is slightly concave. 人的手掌是微凹的。
- A concave surface, structure, or line. 凹面、凹形结构、或凹线
- Concave on both surfaces;biconcave.Used of a lens. 双面均凹进的；双凹的。用于指透镜
- Concave on one side and convex on the other. 一面凹进一面凸起的
- Convex on one side and concave on the other. 凸凹的一面凸一面凹的
- To the excellent concave and convex carving skill. 碑上的阴阳刻。
