单词 | 有外壳 |
例句 | DEFINITIVE EXAMPLES 权威例句〔crust〕To become covered with a crust.有外壳,有硬皮:变得覆有外壳,硬皮美国传统〔unprotected〕The lack of a shell leaves the larvae unprotected against predators.没有外壳保护使这些幼虫不能抵御天敌的捕食。剑桥高阶 |
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