underground和basement的区别

underground是地下的意思，而basement则是地下室的意思，区别可以从以下例子看出：

The basement is located underground, that is why you can't see it on the ground, you can access it from the stair. 地下室位于地下，这就是为什么你在地面上看不到它，你可以从楼梯进入。