A selection of bags were then opened and sorted into different material types, to give a representative sample of the type of waste from food that the school produces.
然后人们把垃圾袋打开，把垃圾进行不同材料的分类，这样能给出学校食物所产生的有代表性的垃圾样品。
The random sample selection and different sample positions ensure the samples to be representative and fair.
计算机随机选择采样点，采样点车车不同，保证了样品的代表性、公正。
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