v. have an existence, be extant
v. support oneself
vi. 存在, 生存, 发生
1. Many people believe that aliens exist in the universe.
很多人相信外星人在宇宙中存在。
2. Do you think happiness can exist without love?
你认为没有爱的情况下快乐能存在吗？
3. Some endangered species may not exist in a few years.
一些濒危物种在几年内可能会消失。