Don't switch on during drilling operation.

钻井作业期间不能合闸。

youdao

If the initial workpiece is solid, a drilling operation must be performed first.

如果初始工件是实心的，则必须首先进行钻孔作业。

youdao

If the initial workpiece is solid, a drilling operation must be performed first.

如果初始工件是实心的，则必须首先进行钻孔作业。

youdao