adj.凹的n.凹面；凹线；凹形
用作形容词 (adj.) The palm of one's hand is slightly concave.
人的手掌是微凹的。
A cylinder is a hollow tube with a closed concave base that permits it to stand upright.
钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。
His figure looks very funny in the concave mirror.
他的样子在凹镜里显得非常可笑。
用作名词 (n.) These are aberration-corrected holographic concave gratings.
下表所列为像差校正全息凹面光栅。
The cloven hooves are sharp edged, elastic and concave.
蹄锋利，呈凹形，富有弹性。
This article has described expanding method for repairing the concave retaining ring caused by the hydraulic bulging.
详细介绍了用扩冲法对液压胀形出现凹形的护环进行修复的方法。
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