1、They go to work by car, on green single-decker buses.
他們乘汽車去上班，在綠色single - decker公共汽車。

2、In the past, there were only single-decker buses. Nowadays, some buses are double-decker buses.
在過去，只有單層公車，而現(xiàn)在，很多都是雙層的公交車。

3、In the past, their were only single-decker buses.
過去只有單層公交車。

single-decker翻譯