manual drilling

例句：

1. 1.We need to manually drill holes in the wall for electrical wiring.
   我们需要在墙上手动钻孔以便电线布线。
2. 2.The manual drilling of the screws was not precise enough.
   螺丝的手动钻孔不够精确。
3. 3. Manual drilling is a time-consuming process that requires skill and precision.
   手动钻孔是一项耗时的过程，需要技巧和精确度。