Cách sử dụng
"Mark off" is a commonly used expression that means to place a mark on something to show that it has been completed or measured. For instance, if you want to make sure that you have read all your assigned pages in a book, you can mark off each page as you complete it. You can also mark off an area on a map to indicate a boundary or divide a space into parts. "Mark off" can be used in situations where you need to keep track of progress or establish clear boundaries.