racking cock

例句：

1. 1.The construction crew used a racking cock to drive the pile into the ground.
   建筑工人使用打桩机将桩打入地面。
2. 2.The engineer had to use a racking cock to lift the heavy beams.
   工程师不得不使用打桩机来抬起沉重的梁。
3. 3. The contractor was responsible for using a racking cock to level the foundation.
   承包商负责使用打桩机来平整地基。