Chalk line: Use it to snap straight guidelines for cutting plywood or laying floor tile.

粉笔线：准则切割胶合板或铺设地板砖用它来来划线。(不知道这个翻译是不是准确！)

youdao

Readjust the top and bottom guidelines so that they are once again snap to the top and bottom of the background image.

重新调整顶部和底部的参考线，直到它们再一次吸附到背景图片的顶端和底端。

youdao

Readjust the top and bottom guidelines so that they are once again snap to the top and bottom of the background image.

重新调整顶部和底部的参考线，直到它们再一次吸附到背景图片的顶端和底端。

youdao