... a hollow tree, ball 中空的树、 球. 2 sunken; deeply set 凹的; 凹陷的: hollow cheeks 凹陷的双颊 ...
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他的胃是凹的。
人的手掌是微凹的。
我们介绍了超凸度量空间中对角拟凸和拟凹的概念。
We introduce concepts of diagonal quasi-convexity and quasi-concavity in hyperconvex metric spaces.
We all know that in 2006 the car had a lot of scratches and it got bended in one side and pretty sorry looking in terms of the scrapes and the paint job and the rust.
我们都知道,2006年的车有很多刮痕,一边车身还凹了,很旧的样子,到处是刮痕,油漆脱落,生锈。
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