1、
The foundations of partition calculus were laid down over twenty years ago by Erdos and Rado.
划分学的基础大约是在二十多年以前由Erdos和Rado奠定的.
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2、
芦苇格姬小蜂为美洲斑潜蝇的幼虫寄生蜂, 比较喜欢在美洲斑潜蝇的三龄幼虫上寄生.
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3、
4、
Today I'm in Erdos, tomorrow I'll be Awati. There are many areas that need our attention.
今天是鄂尔多斯, 明天是阿瓦堤, 有很多地方都要去关注.
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