When a carpenter is about to plane or saw a piece of timber he draws a straight line using a thread .

当一个木匠要刨平或锯一块木材时，他以墨线画一条直线。

youdao

When a carpenter is about to plane or saw a piece of timber he draws a straight line using a thread .

当一个木匠要刨平或锯一块木材时，他以墨线画一条直线。

youdao