重点讲解：
1. shoot down 击落(飞机、直升机、导弹等)；
Several planes were shot down by enemy fire.
几架飞机被敌人的炮火击落A&N|(Nwlb@f+EOdzI。
2. call off 取消；
The union threatened a strike but called it off at the last minute.
工会威胁要罢工，不过在最后一刻取消了行动DQa2^uiv.FfLjQx*Nm。
3. out of the norm 不正常；
"I know it's crazy and out of the norm, but I really enjoy it. It would beat any store window in New York, " Novak said.
“我知道这很疯狂，也不寻常，但我很喜欢，这胜过纽约任何商店的橱窗展示”，诺瓦克说.HM!XFmsSV[wfH。
4. on purpose 特意地；故意地；有意地；
He did it on purpose, knowing it would annoy her.
他明知会激怒她，却故意那么做hs[zY[=-BeK)2db。