handpiece
n. 机头；手持件
例句
The sound and vibration of the handpiece (drill) bother me.
钻牙器的声音和震动使我感到难受。
The good news is the Turbo handpiece is fast and efficient, and literally erases steel.
好消息是，涡轮机头快速，高效，字面清除钢。
When using a rotary handpiece for background removal, be sure to make short pulling strokes.
当使用一个背景去除，旋转机头一定要拉短杆。
