当每次染色体分裂时——即当每次一个细胞分裂成两个时——染色体的尾部，也就是端区，就会发生断裂。
Every time the Chromosome divides—every time one cell divides into two—pieces of the ends of the Chromosome, the telomere, get broken off.
看起来，当通过观察特定染色体上的端粒长度，我们实际上可以预测某些细胞能够成功分裂多久。
It seems that, by looking at the length of the telomeres on specific Chromosomes, we can actually predict pretty much how long certain cells can successfully go on dividing.
当研究人员仔细观察染色体中的DNA 时，他们很惊讶地发现，其中只有一小部分，大约是20%到30%，能转化成有意义的遗传信息。
When researchers look really carefully at the DNA in Chromosomes though, they were amazed to find that only a fraction of it, maybe 20-30%, converts into meaningful genetic information.
当长长的蛇体在波浪中扭曲翻转时，它们把滑块像活塞一样从模块中拖进拖出。
As the long sections twist and turn in the waves they pull the RAMS in and out of the modules like pistons.
然而，卡尔说，当涉及到火星上的生命体时，在那个哲学的背后有很好的逻辑性。
However, Carr says there's good logic behind that philosophy when it comes to life on Mars.
到处都是他的肖像，本周发行的新币上就有他的肖像，当一个党派把自己本身与国家视为一体时，必然会有弊端。
His portrait is ubiquitous, including on new banknotes issued this week. It is not healthy when one party identifies itself so closely with the nation.
当您完成全部火焰体激活与阴影体疗愈技术后，您将很快步入更多的高级技术阶段与更高的能量层面。
When you have finished working through the Flame Body Activations and Shadow Body Healing Techniques, then you will move quickly into more Advanced Techniques and Higher Levels of Energy.
无论做了什么，美国面临了一个在2012年所有的任何经济体中最严重的财政紧缩课题，当暂时税收减免和失业保险在今年年末期满。
Whatever it does, America is currently on course for the most stringent fiscal tightening of any big economy in 2012, as temporary tax cuts and unemployment insurance expire at the end of this year.
当糖皮质激素和海马体中的受体结合时，激活了那些阻止这种激素合成的基因。
When glucocorticoid binds to its receptor in the hippocampus, that activates the expression of genes which dampen further synthesis of the hormone.
当人们想象未来的事件时，前额叶皮层，前扣带皮质和海马体之间，有一个复杂的的“功能耦合" 。
When people imagined future events, there was an intricate "functional coupling" between parts of the prefrontal cortex, the anterior cingulate cortex and the hippocampus.
当这个玻璃通过激光进行"读取"时，体素会产生微小的光漩涡，这些光漩涡的属性是由形成每一个“体素”的激光脉冲所事先决定的。
When that glass is then "read" by a laser, the voxels produce tiny whirlpools of light, the properties of which have already been determined by the polarity of the laser pulse that created each voxel.
当元素表示关系表中的一行或多维立方体中的一个单元时，源元素的定义就变得更加复杂。
The definition of a source element gets more complicated when the element represents a row in a relational table or a cell in a multidimensional cube.
MPI研究的两名作者之一，迪麦仇斯•帕帕迪麦秋指出，当象墨西哥这样的经济体也被击垮时，输出移民的刺激可能再次快速增加。
Demetrios Papademetriou, one of the two authors of the MPI study, notes that as economies such as Mexico's are also battered, the push to export migrants could rise again fast.
当奥巴马进驻白宫的时候，它把这篇叙述体也带上了。
When Obama moved into the White House, he brought the narrative with him.
当人的小脑扁桃体受伤后，就会抑制恐惧情绪的反应，因此不能靠学习行为建立新的恐惧反射。
People with an injured amygdala have dampened emotional responses and so do not learn to fear new things through association.
然而，当扁桃体产生的蛋白质受到阻碍，老鼠也表现出不同的性格特征。
However, when the proteins produced by the amygdala were blocked the mice did not exhibit the same trait.
当受到适当频率的激光撞击时，这种绝缘体即成为导体。
When hit with laser light of the correct frequency, it becomes conductive.
当材料断裂，荚囊就会打开并释放出修复介体，介体变成实体的复合物填补裂缝从而恢复材料的特性。
When the polymer cracks, the capsules break open and release the healing agent, which becomes polymer solid and seals the crack and restores the material's properties.
很多材料都是压电体：甘蔗糖，石英，乃至干燥的骨骼都是，当骨骼受到压力时就能产生电荷。
Lots of materials are piezoelectric: cane sugar, quartz and even dried bone creates an electrical charge when stressed.
而当云体温度低并且含水量很少时，微粒并不能增加云体的厚度和降水强度。
In contrast, aerosols did not increase the thickness or precipitation intensity of clouds which had cold bases and no ice.
当艺术、创造性以及愉悦的热爱融聚一体，新风格开拓者便创造出令人惊喜、着迷，甚至震撼的佳作。
When art, creativity, and the love of pleasing are added to the mix, new-style practitioners create amazing edibles that surprise, fascinate, and even astound.
研究者发现当等离子体辐射开来，其轨迹是杂乱无章的。
The researchers found that the trajectory of plasmons became increasingly disorganized as they strayed.
当全球大多数大型经济体致力于货币宽松与财政紧缩之际，中国的举措却恰恰相反。
While most of the world's largest economies are committed to monetary looseness and fiscal tightness, China is doing just the opposite.
当一种叫淀粉样前体蛋白（APP）的分子被两种酶——分别叫作贝塔-分泌酶和伽玛-分泌酶——切断时就形成了淀粉样斑块。
Amyloid plaques form when a molecule called amyloid precursor protein (APP) is chopped up by two enzymes known as beta-secretase and gamma-secretase.
当“营救”一被提出，所有的目光都聚焦到了德国，这个欧洲最大的经济体、最富信誉的借款人。
When a "rescue" is mentioned, all eyes fix on Germany, Europe's biggest economy and most creditworthy borrower.
当有更多的欧元区经济体陷入困境，除了用一套一揽子财政政策来解决问题以外，别无他法。
When you have more euro-zone economies in trouble than out of it, there's no way to put together a fiscal package to fix the mess.
而当很多先进经济体逆着冷风艰难前行时，诸多新兴市场却高温不退——通胀压力加剧，信贷强劲增长，经常账户逆差不断扩大。
And while many advanced economies face these cold headwinds, many emerging markets are facing too much heat-inflation pressures, strong credit growth, rising current account deficits.
而当很多先进经济体逆着冷风艰难前行时，诸多新兴市场却高温不退——通胀压力加剧，信贷强劲增长，经常账户逆差不断扩大。
And while many advanced economies face these cold headwinds, many emerging markets are facing too much heat-inflation pressures, strong credit growth, rising current account deficits.
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