| 词汇 | concavity | 
| 释义 | concavity  noun [ C or U ] uk/ˌkɒnˈkæv.ə.ti/ us/ˌkɑːnˈkæv.ə.t̬i/  凹形 the quality of curving in, or an object or surface that curves in  The valley looks utterly serene now - a spacious concavity lying between pine-clad peaks. 峡谷是一大片洼地,坐落在松林覆盖的山峦之间,此时显得寂静无声。   There is the slightest hint of concavity that allows the bottle to fit snugly in my grip. 瓶子几无凹处,不容易握住。  See: concave 
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