number of bolt holes in flange

例句：

1. 1. The bolt holes in the flange are drilled to hold the bolts securely in place.
   法兰上的螺栓孔被钻来确保螺栓牢固地固定。
2. 2.The engineer carefully measured the bolt holes and calculated the necessary size for the bolts.
   工程师仔细测量了螺栓孔，并计算了螺栓所需的尺寸。
3. 3. The bolt holes were filled with a special type of glue to ensure a secure connection.
   螺栓孔被一种特殊的胶水填充，以确保牢固的连接。