重点讲解：
1. stay up 深夜不睡；熬夜；
例句：I used to stay up late with my mom and watch movies.
我以前总是和妈妈一起熬夜看电影。
2. in case 以备；以防；免得；
例句：In case anyone was following me, I made an elaborate detour.
为了防止有人跟踪我，我特地绕了弯路。
3. go off （警报器）突然大作；
例句：He heard the alarm go off.
他听见警报响了。
4. oddly enough 奇怪的是；说来也怪；
例句：Oddly enough, that is precisely what I intend.
说也奇怪, 那正是我的打算。

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