缺少体育活动和体重过高是导致胆结石的两大原因。
Lack of physical activity and being overweight are the two main causes of gallstone disease.
缺少场地器材，学习压力大，怕累，缺乏技术指导是影响他们参加课外体育活动最主要的原因。
Lack of sports stadiums and facilities, pressure of learning, fear of hardship, and lack of guidance are the causes effecting their activity.
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