名词
中文翻译：墙壁起重机
同义词：
['wall crane', 'wall hoist', 'wall lifter']
例句：
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1. The construction workers were busy installingthe new wall derricks.
建筑工人忙于安装新的墙壁起重机。
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2. The engineerused a wall derrickto lift the heavy equipment ontothe roof.
工程师使用墙壁起重机将重型设备提升到屋顶。
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3. The wallderrick was essential forlifting heavy materials from the ground.
墙壁起重机对于从地面提升重物至关重要。