Whether this means that the original samples were tainted in some way or that the levels of chemicals vary from sample to sample isn't clear.

这是否意味著原始样本受到某种污染或者化物质的含量因样本而异，原因并不明确。

Oil, gasoline and pesticides, and other toxic agents can contaminate floodwater.

石油、汽油、杀虫剂以及其他有毒物质可能污染洪水。

These are amounts of substances, or pollutants, within something.

它们是某物内物质或污染物的含量。

This also keeps the air, soil, water and crops free from chemicals.

同时还可以让空气、土壤、水以及农作物不受 化物质的污染。

Let's look at a TV factory that pollutes a river with toxic chemicals.

我们来看一家用有毒化物质污染河流的电视工厂。

Nutrient pollution, the chemical runoff from farms, is a much bigger worry, he believes.

他认为，更令人担忧的是来自农场的化物质污染。

The materials pollute the world's oceans, affect wildlife, and turn up in drinking water.

这些物质污染了全球海洋，影响野物，并出现在饮用水中。

I'd wonder, like, oh, I wonder what around me is potentially putting chemical pollutants in the air, whether that's my gas stove or things from a construction site.

我会在想，我周围有什么东西可能会在排放化污染物质，像我的燃气灶啊，路边的工地什么的。

The company that owns the building, said the containers were full of acid and infectant, which they think came into contact with rain water causing a reaction.

拥有这座仓库的集装箱里装满了酸性物质和污染物，他们认为这些物质与雨水接触后产反应。

But at the Fukushima Daiichi Plant, those cooling systems started to fail, reactor course overheated and contaminated water inside the plant with highly radioactive material.

但在福岛第一核电站，这些冷却系统开始出现故障，反应堆过程过热，核电站内的水被高放射性物质污染。

The most alarming of all man's assaults upon the environment is the contamination of air, earth, rivers, and sea with dangerous and even lethal materials.

在所有人类对环境的亵渎行为中，最令人担忧的当属空气、土地、河流以及大海受到的危险的、甚至是致命物质的污染。

Then the water is put through barriers with very small openings, or pores, that remove solids and dangerous materials known as contaminants.

然后，水通过带有非常小的开口或孔洞的屏障，以去除固体和被为污染物的危险物质。

We are in the middle of a lesson about a kind of substance or material that can be used to reduce pollution.

我们正在上一堂关于某种可以用来减少污染的物质或材料的课。

A team from Cambridge University have a plan to sidestep all of that polluting chemistry by reactivating this stuff: used cement.

剑桥大的一个研究小组找到了一个方法，可以避免那些在产水泥过程中产的污染化物质：重熔废水泥。

So we're always trying to find the authentic in a saturated world that's kinda contaminated by materialism.

所以我们总是试图在一个被物质主义污染的饱和世界中找到真实的东西。

One breakthrough occurred when the government signed a pact to check pollutant emissions on all motor vehicles.

政府签署文件检查所有机动车辆污染物质排放量，算是一个突破。

And pollutants are the actual substances that cause pollution… To focus the mind means to concentrate on one idea or thought.

污染物是造成污染的实际物质… … " 集中精神" 是指专注于一个观点或想法。

He spoke to BBC Radio 4's Inside Science program and explained why we should be trying to reduce these pollutants-a word for the substances that cause pollution.

他在BBC电台4频道的节目《Inside Science》中解释了我们为什么应该努力减少这些污染物——这个词指的是引发污染的物质。

He said it was one way to reduce concentrations-he means amounts of substances, pollutants, found in something, which here is the air.

他说这是减少浓度的一种方式——他指的是某些东西中发现的物质、污染物的量，这里指的是空气。

He means amounts of substances, pollutants, found in something, which here is the air.

他指的是在某物中发现的大量物质，污染物，这里是指空气中。