重点讲解：
1. sit down 就座；坐下；
例句：I need to sit down and rest my weary limbs.
我要坐下歇歇腿。
2. go out 外出交际；外出娱乐；
例句：Let's cash in on the fine weather and go out.
我们趁天气好出去玩玩吧。
3. stick with 紧跟；紧随；和…呆在一起；
例句：Stick with him and you won't get lost.
别离开他，你就不会弄丢的。

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