例如是ex还是eg

　　Eg: He will go to college in a month.

　　一个月后，他就去上大学了。

　　Eg: The teacher became happy when she saw us.

　　老师很开心当她看到我们的时候。

　　Eg: Which is bigger, Beijing or New York?

　　哪个城市大些，北京还是纽约？