To travel by bus.

乘公共汽车旅行。

youdao

I always travel by underground.

我总是乘地铁。

《牛津词典》

It'll work out cheaper to travel by bus.

算来还是乘公共汽车便宜些。

《牛津词典》

If you travel by bus in Sao Paulo,Brazil these days your vehicle may be powered by hydrogen fuel cells.

VOA: special.2009.09.07

He would prefer to go by sea, if possible, because it's much quicker, but at least he could travel on the roads that the Romans built and maintained.

可能到话，他更喜欢走海路，因为那样更快，不过至少他能走,罗马人修建保养的路了。

耶鲁公开课 - 新约课程节选

and then by Eurostar and total of 5-hour travel.

然后坐欧洲之星，总共5小时的旅程。

介绍欧洲之星 - SpeakingMax英语口语达人

Long-distance passengers to and from Sicily travel by air and will doubtless keep doing so.

ECONOMIST: The Strait of Messina bridge

Back in the days before they really had airplanes the players would travel by steamship.

CNN: 'Tennis is dependent on jet travel'

The light it cast was enough to travel by without using their night-vision goggles.

WHITEHOUSE: Medal of Honor for Staff Sergeant Salvatore Giunta