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concavity

[kɑːnˈkævəti]

释义

n. 凹面；凹陷
a concave surface or thing; cavity.

例句
Sheldon: Its weight and smoothness, along with the slight concavity of the mirror, means it can spin for a long time. (The Big Bang Theory)
谢尔顿：这玩意的重量和平滑度，加上镜子的轻微凹面，意味着它可以旋转很长时间。（生活大爆炸）