FDA要求瓶装水生产商必须定期对污染物含量进行测定，但该机构认为瓶装水是低风险产品，所以并不一定每年都会对其生产过程进行检查。
The FDA requires bottlers to regularly test for contaminants, but the agency considers bottled water a low-risk product, so plants may not be inspected every year.
空气污染是很复杂的技术问题，很难测定出来，但有几种简易方法来检测房屋附近的空气污染度。
It's a complicated technical issue and it's difficult to know what you're looking for.But there are a few easy ways to check for air pollution near your house.Read on to learn more.
以上结果指出，测定蹄氟是及时监测环境氟污染与早期诊断地方性氟病的一种比较理想的方法。
The above results show that determination of hoof fluoride is a practicable method of monitoring of environmental fluoride pollution in time and of early diagnosis of endemic fluorosis.
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