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。
The researchers' reports are important, he says, because they provide "some of the first evidence of polystyrene as a potential contaminant to wildlife that's more on the molecular level."
研究者们的报告是重要的，他说，因为他们给出了“某种更多的在分子水平的第一手证据证明塑胶作为一种污染物对野生动物的影响。”
The researchers' reports are important, he says, because they provide "some of the first evidence of polystyrene as a potential contaminant to wildlife that's more on the molecular level."
研究者们的报告是重要的，他说，因为他们给出了“某种更多的在分子水平的第一手证据证明塑胶作为一种污染物对野生动物的影响。”
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