单词：that is why
这就是为什么
that is why的用法和样例：
例句
- That is why everything is becoming meaningless.这就是为什么一切都变得愈来愈没有意义了。
- I got up late, that's why I missed the bus.我起床迟了，这就是为什么我没赶上汽车。
- He has so few friends that his life is lonely.他的朋友很少，因此他的生活非常孤单。
- She's not feeling well and is staying in the dorm.她感觉不舒服，因此呆在宿舍里。