名词
中文翻译：扩张钻头
同义词：
['expansion drill', 'expandingtool']
例句：
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1. The engineerused an expanding auger to diga tunnel through the rock.
工程师使用扩张钻头在岩石中挖了一条隧道。
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2.The expanding auger was designed tobreak up frozen soil.
扩张钻头被设计用来破碎冻土。
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3. Theexpanding auger wasused to remove the tree stump from the ground.
扩张钻头被用来把树桩从地里移除。