concavity
英
[kɒn'kævɪtɪ]
美
[kɒn'kævətɪ]
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Noun:
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a shape that curves or bends inward
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the property possessed by a concave shape
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用作名词 (n.)
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And there also was a concavity in his car's front wing (fender).
而且,他的前挡板上还凹陷了好大一块撞痕。
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海词词典,十七年品牌