They traveled on foot, by horseback and by boat to reach the gold fields.

VOA: special.2010.04.25

taxi or by foot. You know, it's a small city, so you can...

出租车或者是步行。旧金山是个小城，所以你可以……

旧金山的公共交通 - SpeakingMax英语口语达人

taxi or by foot. You know, it's a small city, so you can...

出租车或者是步行。旧金山是个小城，所以你可以……

旧金山的公共交通 - SpeakingMax英语口语达人