When using a map,pay attention to the following things.为什么用using?
问题描述：
When using a map,pay attention to the following things.为什么用using?
You must by No.6 bus.为什么呢?
答
1、When using a map,pay attention to the following things.=When you are using/you use a map,pay attention to the following things.=When 【you are using/you use】 a map,【you should】pay attention to t...