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问题的提出 1996年10月,我校例行对在校的2320名学生进行了身体形态、机能的常规体检,统计结果显示,12～17岁学生的肺活量较1995年同期有明显下降,男生的下降幅
The problem was raised. In October 1996, our school routinely conducted physical examinations and physical examinations on the 2,320 students in our school. The statistical results showed that the vital capacity of students aged 12 to 17 years was significantly lower than that of the same period in 1995. Falling range