travel的ing形式是traveling。例句:Some places are more problematic than others for women traveling alone. 例句翻译:对那些独自旅行的女性来说,在有些地方遇到的问题会比其他地方更多。例句:While he had originally traveled in order to study, traveling had become an end in itself.例句翻译:尽管他原本是为了学习而旅行,但旅行过程本身也是一种享受。