This enables the shafts to be lowered into the tank and to operate at the normal water level.

这样就可以把轴（从上方）吊入罐内，并在正常水位下操作。

youdao

This enables the shafts to be lowered into the tank and to operate at the normal water level.

这样就可以把轴（从上方）吊入罐内，并在正常水位下操作。

youdao