Since 1985, China has carried out 4 health surveys on the physical quality of youth.

从1985年开始，中国进行了四次全国青少年体质健康调查。

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Since 1985, China has carried out 4 health surveys on the physical quality of youth.

从1985年开始，中国进行了四次全国青少年体质健康调查。

youdao