that is why

• 这就是为什么； 因此

that is why的用法和样例：

例句

1. 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。
2. 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。
3. 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。
4. She's not feeling well and is staying in the dorm.
   她感觉不舒服，因此呆在宿舍里。