number of bolt hole

例句：

1. 1.The bolt hole in the wall is too small for a key.
   墙上的螺栓孔太小，钥匙插不进去。
2. 2. The carpenter had to remove the bolt hole before he could fix the door.
   木匠在修理门之前必须先把螺栓孔去掉。
3. 3.The engineer carefully measured the bolt hole size and adjusted the screws accordingly.
   工程师仔细测量了螺栓孔的大小，然后相应地调整了螺丝。