The Global Youth Tobacco Survey (GYTS) was initiated in 1999 as joint effort by the WHO, the U. S.

全球性青年烟草调查（GYTS）在1999被创始了作为共同努力由世界卫生组织，美国。

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The Global Youth Tobacco Survey (GYTS) was initiated in 1999 as joint effort by the WHO, the U. S.

全球性青年烟草调查（GYTS）在1999被创始了作为共同努力由世界卫生组织，美国。

youdao