Although the YRBSS results indicate that large Numbers of youth are at risk, it is extremely difficult to identify specific individuals.
虽然YRBSS的结果指出大量青春期少年有风险，但是确定特定的人群仍然是极困难的。
Although the YRBSS results indicate that large Numbers of youth are at risk, it is extremely difficult to identify specific individuals.
虽然YRBSS的结果指出大量青春期少年有风险，但是确定特定的人群仍然是极困难的。
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