TCDD has also been extensively studied for health effects linked to its presence as a contaminant in some batches of the herbicide Agent Orange, which was used as a defoliant during the Vietnam War.
有关TCDD作为某些橙剂(一种在越战中使用的落叶剂)中的有毒物质对健康的影响引起了广泛的研究。
The WHO also stressed that melamine is a contaminant that should not be in food, although sometimes it is unavoidable. So the tolerable level of melamine shouldn't be seen as a safe level.
世卫强调，三聚氰胺这种污染物不应在食品中出现，但有时无法避免，所以这是耐受标准而不是安全标准。
As a new water treatment method, ultrasound technology is mainly based on high temperature pyrogenation and free radical oxidation contaminant during ultrasound process.
超声技术作为一种新型水处理方法，主要是利用超声过程中的高温热解和自由基氧化污染物。
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