Ni hao ming , "trip " is usually shorter in time ,it could be a one day or several day trips to a specific destination . A "journey" is longer , could be for months and could include many countries. " Travel" is a wider concept ,more of the activity itself of doing trips and journeys . btw , ni shi zhongguoren ma? If so , ni keyi bangzhu wo xuexi zhongwen ma?

我发现楼上这位好厉害, 帮别人解决了很多问题

这三个词都指的是旅游，但travel泛指旅行，是不可数名词。例如： Travel is much easier now than it used to be. 现在旅行比过去容易多了。 journey是指“某一次旅行，行程时间比较长的旅行”。例如： I hope you have a good journey. 我希望你旅途愉快。 trip往往是指带有某种特殊目的的短期旅行。例如： He’s away on a business trip this week. 这个星期他外出办事去了。