President Clinton spoke about remembering the separation of the races on buses in the South when he was a boy.

VOA: special.2009.03.08

We developed buddy systems so that people would have people to go with them on the trains, if they are taking buses, no one would go around by themselves there is just kind of anxiety to what might happen.

我们形成了结伴制度,让人们结伴搭乘火车，如果他们乘坐公车的话，没有人会单独出行,对可能发生意外的焦虑在空中弥漫。

普林斯顿公开课 - 人性课程节选

Why,he asks? Because,he says, advertising is everywhere -- online,on television, even outside on buses and billboards.

VOA: special.2010.06.04

There are ads on buses and billboards.

VOA: special.2010.06.04

Instead,visitors travel in small buses that take them to areas where they can walk on paths into the wild areas.

VOA: special.2009.04.15

Traditional buses that run on diesel fuel release harmful carbon dioxide and other pollutants.

VOA: special.2009.09.07

Buses take visitors to areas where they can go on paths into the wilderness.

VOA: special.2009.09.28

The women's group immediately called for all blacks in the city to refuse to ride on city buses on the day of Missus Parks's trial, Monday,December fifth.

VOA: special.2009.03.08

Most buses around the world run on diesel fuel.

VOA: special.2009.09.07

"If we can reduce some of the capacity on the tube network in the center of London and some of the buses, then that's a good thing."

VOA: standard.2010.07.30