英语词汇“To raise or lowerthe boom of a crane or derrick”的翻译、意思、用法、释义-英汉汉英双解词典-良福网

词汇	To raise or lowerthe boom of a crane or derrick
释义	To raise or lowerthe boom of a crane or derrick. 升降使起重机的吊臂上升或下降
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