A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
通是尖头的有螺旋状图案并可以更换，用在柱柄或。
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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悬。”
Small cusps were then added, so the tooth had three in a row, aligned front to back, and connected by crests.
后来，更小尖出现，所以一颗牙齿有成排尖头，从前往后排列，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.
他们大多使用一种叫做冰锯设备——一种有许多尖头圆形金属。
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详细解释
是尖头的有螺旋状图案并
可以更换，用在
柱柄或
。
语版 TED-Ed 演讲精选 
。”
出现，所以一颗牙齿
