南非的政治变革进程已经到了不可逆转的阶段。
The process of political change in South Africa has reached the stage where it is irreversible.
她陷入医生们所说的一种不可逆转的植物人状态已达5年之久。
She had been in what doctors described as an irreversible vegetative state for five years.
剑桥科学家彼得·沃德姆斯自1971年以来一直在测量和监测北极，他说这种减少是不可逆转的。
Cambridge scientist Peter Wadhams, who's been measuring and monitoring the Arctic since 1971, says the decline is irreversible.
他们推断，虽然一些进化上的变化涉及基因的丢失，因此是不可逆转的，但其他的变化可能是基因被关闭的结果。
They reasoned that while some evolutionary changes involve the loss of genes and are therefore irreversible, others may be the result of genes being switched off.
1890年，他提出进化是不可逆转的：“一个有机体无法回到其祖先先前到达的阶段，即使是部分逆转，也不可能。”
In 1890 he proposed that evolution was irreversible: that 'an organism is unable to return, even partially, to a previous stage already realised in the ranks of its ancestors'.
从极地盖帽到赤道森林，这是不可逆转的世界，这就是我们拥有的所有自然。
It is this irreversibly modified world, from the polar caps to the equatorial forests, that is all the nature we have.
这种疾病是不可逆转的、递进的。
而且有的损失是不可逆转的。
而且在一些地方还有不可逆转的进展。
这是一个不可逆转的形势。
也许，这些改变根本就是不可逆转的。
很多变化是不可逆转的。
进化是不可逆转的——至少在分子水平上是如此。
两岁以后，营养不良造成的副作用将是不可逆转的了。
After age two, the negative effects of undernutrition are largely irreversible.
这是不可逆转的趋势。
这一疾病还可造成其它长期不可逆转的后果，例如不育症。
This disease may also have other long-term irreversible consequences, including infertility.
气候变化将是不可逆转的的观点会影响我们应该如何应对气候变化。
The idea that changes will be irreversible has consequences for how we should deal with climate change.
一项新的发人深省的科学研究表明，气候变化基本上是不可逆转的。
Climate change is essentially irreversible, according to a sobering new scientific study.
曾经看似不可逆转的趋势突然来了个一百八十度的大转弯。
It is an abrupt reversal of a once seemingly inexorable trend.
如果是这样，北极地区可能将会有巨大的，甚至不可逆转的变化发生。
If they do, the Arctic could be primed for major, even irreversible, changes.
“我想如果这是不可逆转的，我觉得我们就更有理由要做些事，”她说。
"I guess if it's irreversible, to me it seems all the more reason you might want to do something about it," she says.
气温上升对降雨模式的影响也将是不可逆转的，Solomom教授说。
The effect of rising temperatures on rainfall patterns is also irreversible, says Solomon.
这种疾病是不可逆转的、递进的。它需要一二十年才会逐渐显现出临床症状。
The disease is irreversible and progressive. It takes one or two decades for the disease to develop into a stage that results in clinical symptoms.
如果人才流失成为一种不可逆转的趋势，那么，中国学术界将会形成恶性循环。
If the brain drain becomes an irreversible trend, a vicious circle will take shape in Chinese academia.
失去平衡的生活全无必要，我们必须在不可逆转的事情发生之前扭转这种状态。
Losing this balance is unnecessary and must be reversed before irreversible effects are seen.
他说：“以合理的方法来种植和收获更多能源来源的前途是不可逆转的。”
"There is no turning back from a future in which more of our energy resources are grown and harvested in a sensible way," he said.
他说：“以合理的方法来种植和收获更多能源来源的前途是不可逆转的。”
"There is no turning back from a future in which more of our energy resources are grown and harvested in a sensible way," he said.
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