做有机化学需要知道的东西,你们学这门课程将为课程，也就是有机化学打下基础。
So, you'll be learning in this class 512 a great preparation for 512, which is organic chemistry.
你看，原来某些微生物是化学合成的——它们不需要阳光，因为它们从化学反应中获取能量。
You see, it turns out that certain microorganisms are chemosynthetic—they don't need sunlight because they take their energy from chemical reactions.
如果你可以只在需要的地方喷洒化学药品，为什么要在整个田地里喷洒呢？
Why dose a whole field with chemicals if you can spray only where they are needed?
其他修复壁画的方法可能需要使用化学物质来去除不需要的层，或者使用物理方法将其刮掉。
Other options to restore the frescoes would have required using chemicals to remove the unwanted layer or using physical means to scrape it off.
大多数指纹是肉眼看不见的，需要经过化学显影过程才能显示出来。
Most fingerprints can't be seen to the eye and require a chemical development process in order to make them shown.
如果没有化学，我们永远不会知道我们需要肥皂来去除衣服上的油污。
Without chemistry, we would never have known that we need soap to get the oil out of clothes.
研究者们还需要判断嗅觉到底是一种还是两种感觉，一种感觉回应气味本身，另一种感觉记录空气中无味的化学成分。
Researchers have still to decide whether smell is one sense or two—one responding to odours properly and the other registering odourless chemicals in the air.
激光需要的化学燃料或者电力还没办法轻易安置在太空。
Lasers also need chemical fuel or electrical power which is not readily available in space.
它说明了对企业间沟通的可追溯性的急切的需要，其它工业，如化学和制药等也有相似之处。
This illustrates a critical need for cross-enterprise traceability, common with other industries such as chemicals or pharmaceuticals for instance.
这是一种全新的处理方法，需要在材料科学、化学和物理学诸方面进行新的研究。
It s a novel approach that will require new research in materials science, chemistry and physics to work.
但是如果用纳米孔，实质上就不需要化学与处理和“放大”，取而代之的是，可以一次一个碱基对地读出单条dna链，也不用标记。
With nanopores, however, virtually no chemical pre-processing is required and no amplification. Instead a single strand of DNA can be read, one base pair at a time, and without the need for labelling.
例如，对于气候变化的深入了解需要气象学、化学、经济学和法学等等相关知识。
A true understanding of climate change, for instance, requires a knowledge of meteorology, chemistry, economics and law, among many other things.
化学工业所需要的原料配方有误，就会危及到我们周围的环境以及人类的健康。
The chemical industry relies on many ingredients that in the wrong place are harmful to the environment, human health or both.
为揭露这一化学反应之秘密，科学家们需要借助一组工具进行分析。
Uncovering the secrets of the chemical reaction required the scientists to use an array of analytical tools.
对二恶英进行化学量化分析需要非常先进的方法，世界上只有数量有限的几个实验室能够做到。
The quantitative chemical analysis of dioxins requires sophisticated methods that are available only in a limited number of laboratories around the world.
这种火箭需要携带的燃料也减少了，并且不需要化学氧化剂。
It thus needs to carry less fuel than a rocket, and no chemical oxidant to burn that fuel, as a rocket would.
传统的化学合成无法区别左右手螺旋，需要在合成后单独进行枯燥的分离。
Traditional chemical synthesis cannot distinguish between left - and right-handed versions, so they have to be separated afterwards, which is tedious.
它们常常处于激活状态，而不需要受特殊化学信号激活。
Instead of needing to be activated by a specific chemical messenger, the engineered fat cells are always active.
科学家们称，要全面鉴别出某种物体的化学成分，需要使用频率连续变化的太赫兹频率级激光对物体进行照射。
The researchers say that accurately determining the chemical composition of objects requires exposing it to different and continuous ranges of terahertz frequencies.
我们需要考虑，混合体的化学势。
Where I'm going to have to worry about the chemical potentials of mixtures.
我们需要写出，物质a的化学势。
And we're going to have to write chemical potential for a species, a, let's say, which is in solution.
如果我们能够绘制人类基因组，为什么还需要把化学品注入到狗的眼睛里呢？
If we can map the human genome, why do we need to pour chemicals in a dog's eyes?
碳捕获过程中的化学处理过程需要能量，压缩和运输二氧化碳同样需要能量。
The chemical steps in the capture consume energy, as do the compression and transport of the carbon dioxide.
你的身体为了赶上怀孕期间扩大的血液容量，需要更多的这种化学元素。
Your body needs more of this mineral during pregnancy to keep up with your expanding blood volume.
尽管各地区提取元素方法不同，但是都需要一些剧毒化学物质。
Although the extraction process in each location differs, they share a need for highly toxic chemicals.
化学威胁需要不同的防护手段，因为化学品以雾或蒸气的形式存在，微粒过滤器对它们无效。
A chemical threat needs a different approach, because chemicals come as mists or vapors that are largely immune to particulate filtration.
为了适应这些化学制品，人类需要付出的时间不会只是一个人一生的时间，而是几代人的时间。
To adjust to these chemicals would require not merely the years of a man's life but the life of generations.
为了适应这些化学制品，人类需要付出的时间不会只是一个人一生的时间，而是几代人的时间。
To adjust to these chemicals would require not merely the years of a man's life but the life of generations.
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