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重点讲解：
1.raise your hands 举手
例句：Raise your hands and let me see. Right!
举手给我看一下，对啊！
2.bring up 抚养；教导
例句：I think it should be to bring up a child.
我想应该是抚养孩子吧。
3.far more 更加
例句：Any alien civilisations that existed were likely to be far more advanced than ours, he said.
他说，任何现存的外星文明可能都比我们更先进。
4.be strangers to 形同陌路
例句：Sometimes teenagers can be complete strangers to their parents
有时候，青少年与他们的父母可能会形同陌路。
