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。
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。
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。

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