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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。
- Put the dagger back in its sheath. 把短剑插回鞘内。
- An indented or concave surface or area. 凹陷，洼地凹的表面或地区
- concave sheath 凹形镜鞘
- Forming or enclosed in a sheath. 有鞘的形成鞘的或装在鞘内的
- The sheath of connective tissue enclosing a bundle of nerve fibers. 经来膜包裹住神经纤维的膜状结缔组织
- 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。
- 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
- Relating to or resembling a sheath. 鞘的与鞘有关的或鞘状的
- He drew his sword from its sheath. 他拔剑出鞘。
- He drew the knife from its sheath. 他把刀从刀套里退出来。
- A protective covering or sheath. 鞘一种保护性的覆盖物或套
- Concave on both surfaces;biconcave.Used of a lens. 双面均凹进的；双凹的。用于指透镜
- An enveloping sheath or envelope. 外皮或包膜一个包装壳或外壳
- Concave on one side and convex on the other. 一面凹进一面凸起的
- His sword now sleeps in the sheath. 他的剑现在在鞘内。
- Convex on one side and concave on the other. 凸凹的一面凸一面凹的
