1、You have to change down when you drive up a slope
當你開車爬坡時，得換成低速檔。

2、You have to change down when you drive up a slope.
當你開車爬坡時，得換成低速檔。

3、I must change down now
我現(xiàn)在必須放慢車速了。

4、But even may admits that may change down the road.
但是他也承認這種現(xiàn)狀可能會發(fā)生改變。

change down翻譯