Kids should not carry backpacks that weigh more than 10 to 15 percent of their body weight.

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/18 21:14:28

Kids should not carry backpacks that weigh more than 10 to 15 percent of their body weight.

孩子们不应该携带书包重量超过10到百分之十五的体重.