substances

In experimenting we find out that sound travels with different velocities through different substances.

在实验中,我们发现声音以不同的速度通过不同的物质而传播.

Substances consist of small particles called molecules.

物质是由叫做分子的微粒组成的.

toxic chemicals/fumes/gases/substances

有毒的化学品 / 烟雾 / 气体 / 物质

The goal is complete abstention from all mind-altering substances.

目标是彻底戒绝所有致幻物质。

highly reactive substances

很容易起反应的物质

poisonous substances

有毒物质

Most of these nourishing substances are in the yolk of the egg.

这些营养物质中的大部分在蛋黄里。

The fatty substances have been rendered down.

脂肪已提炼出来了.

All materials are made from different simple substances called " elements ".

一切物质都是由一些各不相同被称为 “ 元素 ” 的简单物质构成的.

Since these substances are not licensed, they cannot be sold in the continental United States.

由于这些物品没有许可证，所以不能在美国大陆地区销售。

Soil consists of various chemical substances.

土壤由各种化学物质组成.

Clay and wax are plastic substances.

黏土和蜡是可塑性物质.

There's absolutely no regulation of cigarettes to make sure that they don't include poisonous substances...

根本没有法规来确保香烟不含有毒物质。

...unidentified cancer-causing substances in the environment.

环境中未知的致癌物质

Few substances can equal fur as an insulator.

作为绝缘体很少有其他材料能与动物皮毛相媲美.

It empowers the EPA to adopt rules requiring testing by manufacturers of substances.

这一条款授权环境保护局正式通过一些法规,这些法规要求有毒物质的制造者自检.

Many highly corrosive substances are used in the nuclear industry.

核工业使用许多腐蚀性很强的物质.

Let's compare the physical properties of the two substances.

我们来比较一下这两种物质的物理特性。

banned/illegal substances (= drugs)

禁用 / 非法物品

substances with high levels of toxicity

毒性大的物质

Compare the physical properties of the two substances.

比较一下这两种物质的物理特性。

Substances have no tendency to expand unless ( they are ) heated.

除非 受热,物质不会有膨胀的倾向.

Mingle these two substances before the experiment.

实验之前先将这两种物质混合起来.

Chalk and cheese are disparate substances.

粉笔和乳酪是完全不同的东西.

These are substances which specifically latch onto the protein on the cell membrane.

这些物质专门依附在细胞膜的蛋白质之上。

Some dense substances allow electricity to flow through them freely.

有些密度大的物质容易让电流通过.

Scientists claim to have identified natural substances with cancer-combating properties.

科学家们声称已经发现自然界的某些物质具有抗癌特性。

Third, the Act creates a Hazardous Substances Trust Fund to pay for removal and remedial actions.

第三, 法案设立了“危险物质信托基金”,用以支付迁移和补偿行为.

Substances such as ammonia give out heat when they dissolve.

诸如氨气之类的物质在溶解时会释放出热量。

Even innocuous substances can sometimes register a positive result in a drug test.

即使无害的物质在药物测试中有时也会呈阳性.