travel by：搭乘 如:to travel by plane：乘飛機(jī)出行 后面接交通工具,表示出行方式.并且是強(qiáng)調(diào)方式.travel in并不是強(qiáng)調(diào)"旅行"而是強(qiáng)調(diào)經(jīng)商.travel in旅行推銷(某產(chǎn)品),四出兜銷：She travels in stationery.她到處...Kate Middleton will make her first journey as a member of the Royal family in the same carriage that Diana, Princess of Wales, travelled in on her wedding day. 這句話的travel in呢作者的用意也應(yīng)該是在表達(dá)一種"推銷"; 這個(gè)詞用得很巧,應(yīng)該是把Diana的這種行為,當(dāng)成了向她的臣民推銷自己.這本來也是她旅行的目的.