重點講解：
1. get a crush on sb.
迷戀；愛慕某人；
eg. It takes only a minute to get a crush on someone, but it takes a lifetime to forget someone.
愛上某個人可能只需要幾分鐘時間，但是要忘記一個人可能要一生的時間。
eg. Some teenager girls got a crush on the film star.
十幾歲的女孩子一下子就愛上了那個電影明星了。
2. just in case/in case of
以備；以防；免得；
eg. Extra boiling water should be kept at hand just in case it is needed.
身邊應(yīng)多準(zhǔn)備一些開水，以備不時之需。
eg. In case of fire, ring the alarm bell.
如遇失火，請按警鈴。
3. be meant to
注定（或肯定）要…；
eg. John was constantly reassuring me that we were meant to be together.
約翰不斷安慰我說，我們注定要在一起。
eg. Life is always meant to be unpredictable.
生活注定就是一波三折的。
4. be supposed to do sth.
應(yīng)當(dāng)，應(yīng)該，須；
eg. Don't be too curious about things you are not supposed to know.
對于你不應(yīng)該知道的事情別去好奇地打聽。
eg. You are supposed to be on the lookout for things like that.
這類事情你本該小心點才是。