manually operated pile driver

例句：

1. 1.The manual operation of the pile driver ensures that the construction is done safely and efficiently.
   手动操作的桩机确保施工安全高效。
2. 2.The manual operation of the pile driver is crucial for ensuring the stability of the foundation.
   手动操作的桩机对于确保地基的稳定性至关重要。
3. 3.The manual operation of the pile driver allows for precise control over the depth and placement of the piles.
   手动操作的桩机允许对桩的深度和位置进行精确控制。