traveled是美式英语，travelled是英式英语。
traveled adj.富有旅行经验的;旅客多的;旅客使用的;旅客常到的；
travelled adj.有过…次旅行的;到过…地方的；长途行走;旅行;
She travelled the world in pursuit of her dreams.
她走遍天下，追寻她的梦想。
They've travelled all over the world.
他们游遍了全世界。
We travelled further inland the next day.
我们第二天继续向内陆行进。
When candidates went stumping around the country, people traveled for miles on foot, by horse, by carriage to hear them speak
当竞选人在全国作巡回演说时，人们会步行、骑马或坐车数英里赶去听他们的演讲。
They traveled under the protection of a number of soldiers.
他们在一些士兵的护卫下旅行。
They traveled to Shanghai in third class.
他们乘三等舱去上海旅行。
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