Please write on both sides of the paper, and don't write in the margin.
请在纸的正反两面书写, 但不要写在四周的边上.
The computer has been programmed (to calculate the gross profit margin on all sales).
计算机已输入了程序指令(以计算各项销售的毛利率).
There was a nice red tick in the margin.
边上打了一个漂亮的红勾。