专家说需要对每种污染物进行测试，以查明对人类的长期影响。
Experts say testing needs to be done on each contaminant to determine the long-term effects on humans.
这种系统正在少数商店进行测试。
Such systems are going through tests in a small number of stores.
年龄从12岁到83岁不等的人被要求进行测试。
People of different ages from 12 to 83 were asked to have a test.
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