The postcode of Erqi District, Zhengzhou City, Henan Province, China is 450000.

中国大陆河南省郑州市二七区的邮政编码是450000。

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So they rush to the sea Erqi Plaza of the text book market, specified essay reference books to find a teacher.

于是她们蜂拥至二七广场的文海书市，找老师指定的作文参考书。

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Pathogenic factors of leukemia in Erqi and Zhonyuan Districts of ZhengZhoufrom 1986 to 1988 were investigated.

对郑州市二七区、中原区1986 ~ 1988年白血病的发病因素进行了调查。

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