| 单词 | undersurface |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔ambulacrum〕One of the five radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.步带：海星和类似棘皮动物底部五个辐射状排列部位中的一个，触手从这里进行伸缩美国传统〔wedgie〕A shoe having a wedge-shaped heel joined to a half sole so as to form a continuous undersurface. Often used in the plural.坡跟鞋：其楔形后跟与鞋底的一半相连，形成一个连续的底面的鞋。常用作复数美国传统 |
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