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Acid 酸 Why does the lemon taste sour? 为什么柠檬的味道很酸？ It is because of the acid in a lemon. 因为柠檬里有酸。 Then what is acid? 那么什么是酸？ All substances with a sour taste are kinds of acid. 所有带酸味的物质
与美国小学生一起学英文第12册
By Tom Rivers London 19 September 2009 Abdel Baset al-Megrahi in his room, in Tripoli international hospital, Libya, 09 Sep 2009 Scotland's chief prosecutor has denounced convicted Lockerbie bomber Abdel Baset al-Megrahi for posting the first of hun
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The armies of India and Pakistan have again exchanged fire on the line-of-control in the Kashmir region. The ceasefire violation took place Thursday evening around 180 kilometers southwest of Srinagar city, the summer capital of Indian- controlled Ka
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