When you have finished an exercise, rule off.

做完一个练习，就画一条线隔开。

youdao

Write out the figures in a column and rule off at the bottom where you want the total to go.

把数字写在一栏中，再在下面划线隔开，以便填写总数。

youdao

Write out the figures in a column and rule off at the bottom where you want the total to go.

把数字写在一栏中，再在下面划线隔开，以便填写总数。

youdao