不断退火，锻打，直到割痕消失。

Repeating annealing and forging till cutting marks were gone.

youdao

从原点至无穷远处的曲线起分支割痕的作用。

Curves running from the origin to infinity may serve as branch cuts.

youdao

从原点至无穷远处的曲线起分支割痕的作用。

Curves running from the origin to infinity may serve as branch cuts.

youdao