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3. What do you mean by...

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25. keep in mind 記在心上

　　 ☆交際用語(yǔ)☆

24. in case of 以防……

23. in honor of 紀(jì)念……，慶�！�…

22. die of 死于

21. roll over 翻轉(zhuǎn)

20. first of all 首先

19. first aid 急救