名词
中文翻译：残骸起重机
同义词：
['broken derrick', 'wrecked derrick']
例句：
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1.The old shipwreck was recently discovered by divers on the ocean floor.
这艘旧沉船最近被潜水员在海底发现。
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2.The engineer inspected the wreck derrick to ensure it was safe for use.
工程师检查了残骸起重机以确保它安全可用。
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3.The wreck derrick was used to salvage the sunken ship's valuable cargo.
残骸起重机被用来打捞沉船的宝贵货物。