重点讲解：
1. be good at 擅长的；精通的；能干的；
例句：He was very good at his work.
他工作非常出色Gc&lcRk-vjSeyu)y+!r。
2. get up 起床；
例句：They have to get up early in the morning.
他们大清早就得起床tll=*JPam8T@k1zmcsIy。
3. sleep in 睡懒觉；睡过头；
例句：I slept in and missed an important meeting.
我睡过了头，没有参加一个重要的会.zx2.!tl^mg-I]2。