唐雎说信陵君

    信陵君杀晋鄙，救邯郸，破秦军，存赵国。赵王自郊迎。唐雎谓信陵君曰：“臣闻之曰：‘事有不可知者，有不可不知者；有不可忘者，有不可不忘者。’”信陵君曰：“何谓也？”对曰：“人之憎我也，不可不知也；我憎人也，不可得而知也；人之有德于我也，不可忘也；吾有德于人也，不可不忘也。今君杀晋鄙，救邯郸，破秦人，存赵国，此大德也。今赵王自郊迎，卒然见赵王，愿君之忘之也!”信陵君曰：“无忘谨受教。”

比较《唐雎不辱使命》与《唐雎说信陵君》，思考这两篇文章表达的中心有什么不同？

    One day three Frenchmen who did not know English very well were talking about the English language.
The first Frenchman said, ‘I heard someone shout ‘look out’ ,I put my head out of a window and a basin of water fell on me. It seems that ‘look out’ may mean ‘don't look out!’
    The second one followed, ‘ I was once on a ship and heard the captain（船长） shout, ‘All hands on the deck(甲板)’ I put my hands on the deck and someone trod(踩)on them.’
    The third one told his friends his experience too, ‘One early morning I called on my English friend and the maid(女佣) said, ‘He is not up yet, come back in half an hour.’ When I went again for him, she said, ‘He’s not down yet.’I said, ‘If he’s not up and he is not down, where is he then?    What a strange language it is!’

①碳酸钠溶液与沙子      ②粗盐              ③SiO₂和Al₂O₃混合物

④水和汽油的混合物      ⑤用CCl₄提取碘水中的碘