Many grooves are cut using the parting tool and then a hole is drilled down the middle from each end.

许多沟槽切割工具使用临别，然后钻了一个洞是从中间的每一端。

youdao

Many grooves are cut using the parting tool and then a hole is drilled down the middle from each end.

许多沟槽切割工具使用临别，然后钻了一个洞是从中间的每一端。

youdao