A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
通常是尖头的有螺案并可以，在钻柱钻柄或钻床上。
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I saw a cantilever with the tip and a spring on the ceiling.”
我在天花板上看到了有尖头和弹簧的悬臂。”
Small cusps were then added, so the tooth had three in a row, aligned front to back, and connected by crests.
，更小的尖出现，所以齿有成排的三个尖头，从前往排列，并由凹槽相连接。
They mostly use a device called an ice saw —a large, round piece of metal with many sharp points.
他们大多使用种叫做冰锯的设备——种有许多尖头的圆形金属。
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划词翻译
详细解释
案并
可以
，
在钻柱钻柄或钻床上。
，更小
出现，所以
齿
