lever head

例句：

1. 1. The engineer used a lever to lift the heavy machine.
   工程师用杠杆把重机器抬起来。
2. 2. The carpenter carefully measured the length of the lumber for the new table.
   木匠仔细测量了新桌子的木板长度。
3. 3.The scientist used a lever to dislodge the blockage in the pipeline.
   科学家用杠杆把管道中的堵塞物移开。