How can such a substance have an effect on the body?
这样的一种物质是如何对人体产生影响的呢？
Caffeine, a substance found in coffee and some soft drinks, is also a drug.
咖啡因，咖啡和一些不含酒精的饮料中的一种物质，也是一种毒品。
我们有一种工作物质。
Life is an energy, not a substance.
生命是一种能量，而不是一种物质。
Life is an energy, not a substance.
生命是能量，不是物质。
And it is not thought of as a substance.
它没有想到的是作为一种物质。
"Fluid" means a substance that can flow.
所谓“流体”是指可流动的物质。
A substance that is not formed by natural growth.
不是通过自然生长形成的物质。
The term "fluid" means a substance that can flow.
所谓“流体”是指可流动的物质。
You need that object to be a substance, to be something.
这个物体得是某种物质，某种实体。
Charge may be given to or removed from a substance.
电荷可以充入一物质也可以从中移去。
A compound is a substance made up of two or more elements.
化合物是由两种或两种以上元素构成的物质。
Plastic is a substance that hardly decomposes in the nature.
塑料是一种在自然中极难降解的物质。
Did you ever think you might have a substance-abuse problem?
做你认为你可能有一个恶瘾问题吗？
A substance having a specific toxic effect on certain cells.
真菌感染能产生一些有害物质—毒枝毒素。
A fuel is a substance used to generate light, heat or energy.
燃料是一种用来产生光、热或能量的物质。
Nitrite is a substance that is toxic to fish and invertebrates.
亚硝酸盐是一种有毒物质，对鱼类和无脊椎动物有毒。
We may not be able to identify a substance from a single property.
凭单一性质我们也许不能别出一种物质。
If you have a substance abuse problem, remember that help is available.
如果你有滥用物品的问题，记住，帮助是有的。
Life is a flame, not an existence. Life is an energy, not a substance.
生命是火焰，不是存在。生命是能量，不是物质。
A compound is a substance that can be split into two or more elements.
一种化合物是一种可以拆分为两个或多个元素的物质。
Life is a flame, not an existence. Life is an energy, not a substance.
生命是火焰，不是存在；生命是活力，不是物质。
That is to say, a substance can exist, although at times nothing betrays its presence.
就是说，一个物质尽管有时候让人觉察不到，但它还是存在着。
The purification of a substance by exposure to the mechanical or chemical action of air.
物质暴露于空气中，通过机械作用或化学反应使其纯化。
It was a hard task to remove the spilled substance.
清除溢出的物质是一项艰巨的任务。
黏土是可塑物质。
黏土是可塑物质。
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