RFK Jr. has brought up the health of young American men in the context of a universal national military service—but the data on why young people are struggling tells a different story than the one the US health secretary tends to reference. If a draft does return, most young people wouldn’t qualify… and the real reasons might surprise you.

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能改变理解方式，而不只是重复常识；有直接可用的方法、工具或操作价值；它提供了新的理解或解释，而不只是表面观点

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