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

、汽、杀虫剂以及其他有毒物质可能污染洪水。

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。

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 化学物质的污染。

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

我们来看一家用有毒化学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，更令担忧的是来自农场的化学物质污染。

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，影响野生生物，并出现在饮用水中。

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

它们是某物内物质或污染物的含量。

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.

政府签署件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… … " 中精神" 是指专注于一个观点或想法。

Those thrusters left foreign chemicals on the ground, contaminating soil samples.

那些推进器在地面上留下了外来化学物质，污染了土壤样本。

And it isn't just chemicals polluting the water.

而且不仅仅是化学物质污染了水源。

You don't want those neurons to get contaminated with things.

你不希望这些神经元被外界物质污染。

Definitely don't wander into the forest, where the trees are contaminated with radioactivity.

绝对不要走进森林，那里的树木都被放射性物质污染了。

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

剑桥大学的一个研究小组找到了一个方法，可以避免那些在生产水泥过程中产生的污染化学物质：重熔废水泥。

There was pollution everywhere, and toxic substances were seeping into the soil.

到处都是污染， 有毒物质渗入土壤。

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。

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，以去除固体和被称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。

The water could have other chemicals in it – other things that may pollute the water.

水中可能含有其他化学物质——其他可能污染水的物质。