名词
中文翻译：钻头
同义词：
['screw', 'rod', 'drill bit']
例句：
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1.The engineer used a drill string to bore through the rock.
工程师用钻杆钻穿了岩石。
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2.The drill string was essential for the construction of the new bridge.
钻杆对于建造新桥至关重要。
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3. The drill string was used to test the integrity of the foundation.
钻杆被用来测试地基的完整性。