十九

One11-year-old boy crosses the river every school day.

A four-day trip.一次为期4天的旅行。

School day是在小学生上学的日子，尤指周一至周五。

I can't watch TV on school days and I can only watch for two hours on the weekend, 在周一至周五上学期间我不能看电视，在周末我也只能看两小时。