Great care was taken to try and get a representative sample of the general population.
受访人群都是经过细心挑选，能够代表大众的。
Middle school students sample included two population, superior grade and inferior grade.
其中，初中生群体又包括快班和慢班两个小的被试群体。
Middle school students sample included two population, superior grade and inferior grade.
其中，初中生群体又包括快班和慢班两个小的被试群体。
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