A drug is a chemical substance.
毒品是一种化学物质。
A molecule is the smallest part of a chemical substance.
分子是化学物质的最小的部分。
A chemical substance that prevents or slows a cathodic or reduction reaction.
一种阻止或减缓阴极反应的化学物质。
We can get a new substance if we incorporate a chemical substance with others.
如果我们把一种化学物质和其他化学物质混合就能得到一种新物质。
Serotonin is a chemical substance involved in sending signals in the nervous system.
血液中的复合胺是一种在神经系统中参与传递信号的化学物质。
The mythical philosopher's stone, or sorcerer's stone, is said to be a chemical substance capable of turning lead into gold.
神秘的点金石，或魔法石，据说是一种能将铅转化为金的化学物质。
A chemical substance in the digestive system of the palm civet causes some changes to the beans to give them a unique flavor.
一种在麝香猫消化系统内的化学物质会改变咖啡豆，让它们有一种特殊香气。
Silane coupling agent is a chemical substance, which can enhance the interface adhesion between inorganic fillers and resins.
硅烷偶联剂是应用最广的一类偶联剂。
Reducing agent, a chemical substance that gives electrons to another substance. A reducing agent is in contrast to an oxidizing agent.
一种把电子给另一种物质的化学物质，还原剂相对的是氧化剂。
Every chemical substance is a key to the gates of heaven and hell.
每一种化学物质都是一把打开天堂和地狱之门的钥匙。
One way of identifying a substance without resorting to fiddly chemical methods is to determine its density.
其中一种不用高精度的化学方法验证物质的办法就是确定它的密度。
One way to identify a substance without resorting to fiddly chemical methods is to determine its density.
要分辨一种物质，可以用密度测量法。而无须借助费事繁琐的化学分析法。
Like cayenne pepper, it has the ability to deplete nerve cells of substance p, a chemical that transmits pain signals to the brain, when used externally.
就像辣椒一样，外用时能消耗传送疼痛信号到大脑的神经细胞中一种称为P物质的化学物质。
Over time, it short-circuits pain by depleting nerve cells of a chemical called substance p, which helps transfer pain signals along nerve endings to the brain.
随着时间的推移，它通过消耗神经细胞中一种叫做P物质(或称肽物质，一种神经传递介质)的化学物质来减轻疼痛，该物质使痛觉信号沿神经末梢传递至大脑。
Dr Yun plumped instead for a chemical called Green Flourescent Protein (GFP), the substance responsible for making certain species of jellyfish glow in the dark.
Yun博士果断放弃了传统介质，选用了绿色荧光蛋白(GFP)作为介质——这种物质能使一种生活在黑暗中的水母发光。
This substance can be reduced to a single chemical and oxygen by passing an electrical charge through it.
通电后，这种物质可以被分解为一种单一的化学制品和氧。
Let's take a look at how the toxic chemical substance was found on the island.
让我们看看台湾如何发现这种有毒化学物品的。
An antioxidant is a chemical compound or substance that inhibits oxidation.
抗氧化物是一种化学复合物或物质，可抑制氧化。
They tested the chemical extracts of the plants on a substance called Brewer's yeast.
他们用布鲁尔氏酵母的物质，测试了这种化学提取物。
A chemical change is one in which the structure of particles is changed and a new substance is formed.
化学变化是一种改变粒子结构、形成新物质的一种变化。
To produce or obtain (a compound) from another substance by chemical reaction.
通过化学反应从别的物质生成或得到(某种化合物)。
The main cause of this area's water pollution is the chemical substance that leaks out of a paper mill by the river bank.
这一地区水污染的主要原因是河边一家造纸厂泄漏的化学物质。
Chemistry Physics a substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
【物理学】元素：元素，由原子组成的物质，其原子中的每一核子具有同样数量的中子、用一般的化学方法不能使之变得更为简单的物质的元素。
ALLOY: a substance with metallic properties composed of two or more chemical elements at least one of which is metal.
合金：由一种金属跟另一种或几种金属或非金属所组成的具有金属特性的物质。
After a potential new drug substance is discovered and undergoes definitive chemical and physical characterization, a great deal of biological information must be gathered.
当一种潜在的新药被发现并经历了明确的化学上及物理学上的鉴定之后，还有很多生物学的信息需要收集。
Nevertheless, pullulan is a natural substance, as is apparent from its chemical structure.
普鲁兰多糖是一种天然物质，看其化学机构即可一目了然。
When matter is changed to a substance different from what it was , the change is a chemical change .
当物质变成与其原来不一样的另一物质时，这种变化是化学变化。
A chemical change is one in which the structure of particles is changed and a new substance is formed.
化学变化是改变分子结构、化学变化是改变分子结构、形成新物质的一种变化。
A chemical change is one in which the structure of particles is changed and a new substance is formed.
化学变化是改变分子结构、化学变化是改变分子结构、形成新物质的一种变化。
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