| 单词 | protrusions |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔protrusion〕It has a series of protrusions along its back.它背上有一连串的凸起。剑桥高阶〔trident〕Having three teeth, prongs, or similar protrusions.三齿的：具有三个齿、三个突起或三尖头的美国传统 |
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