1. That's 是缩写形式,全称是 "that is",意思是 "那是" 或者 "那就是"。2. 在对话中,That's 通常用来表示对之前所说内容的确认或者总结。3. 举例来说,如果有人说 "I love to travel and explore new places.",你可以回答 "That's great! Traveling is a wonderful way to broaden your horizons and experience different cultures.",这里的 That's 表示对对方的兴趣的肯定和赞同。That's 还可以用来表示对某个情况或者事实的或者说明,例如 "That's because the weather has been really hot lately.",这里的 That's 表示对之前所提到的天气炎热的原因的。