如果有缘 » If this is the fate 是一名中学生 » Was a middle school students 这个男孩没有出去而是继续做作业。（keep doing sth。
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Like most students, when studying at middle school, I found math interesting but difficult, which was a challenge for me.
像大多数学生一样，读中学时，我觉得数学虽有趣但很难，这对我来说是一个挑战。
For example, in looking at survey data on the health behavior of middle and high school students, the factor I found that best predicted whether or not a kid was obese was tooth brushing.
譬如说，在观察了一份有关中学生和大学生健康行为的调查后，我发现一个孩子是否肥胖的最佳预知方法是看刷牙。
In a sample of middle- and high school students, the illicit useof stimulant medication was 4.5 percent.
中学生和高中生样本中非法服用兴奋剂的比例是百分之四点五。
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