ratchet-and-pawl是什么意思，ratchet-and-pawl的翻译，ratchet-and-pawl音标、读音、用法和例句

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ratchet-and-pawl是什么意思，ratchet-and-pawl的翻译，ratchet-and-pawl音标、读音、用法和例句_魏碑心思朗文词典