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eric is in Class One his twin brother is in Class Two.并成一句

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eric is in Class One his twin brother is in Class Two.并成一句
Eric is in Class One while his twin brother is in class two.
while 常用语连结两个句子,并表示前后对比.
如:I was watching tv while my father was reading newspapers.
我在看电视,老爸在看报纸.