Carrying person was the most frequent risk behavior.
骑车带人是最常见的危险行为。
Researches on risk behavior have been done for more than ten years in western countries.
危险行为的研究在西方已进行了十几年，但我国的研究还较少。
Researches on risk behavior have been done for more than ten years in western countries.
危险行为的研究在西方已进行了十几年，但我国的研究还较少。
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