名词
中文翻译：Unknown
同义词：
['port crane', 'dock crane', 'tugboat例句：1. The port crane was used to lift the heavy cargo.（港口起重机被用来搬运沉重的货物。）']
例句：
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1. The port crane was used to lift the heavy cargo.
港口起重机被用来搬运沉重的货物。
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2. The dock crane is essential for loading and unloading ships at the dock.
码头起重机对于在码头装卸船只至关重要。
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3. The tugboat was used to help the ship navigate through the busy harbor.
拖船被用来帮助船只在繁忙的港口航行。