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.
不同于循环时间与不可逆时间，壮观时间是一种制造伪事件的积木。
Different from the circular time and the irreversible time, the spectacular time is a kind of toy bricks producing pseudo-events.
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.
从那以后，人们又发现了许多其他的例子；因此，“进化几乎是不可逆的”这一说法就不再有意义了。
Since then, so many other examples have been discovered that it no longer makes sense to say that evolution is as good as 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'.
我们迫切需要采取行动以恢复适当的价格激励政策，特别是通过纠正碳定价，以降低气候变化产生不可逆转和潜在破坏性影响的风险。
Action to restore appropriate price incentives, notably through corrective carbon pricing, is urgently needed to lower the risk of irreversible and potentially devastating effects of climate change.
手术不可逆转，无法使她重获生育能力。
你也不能让它变得更好，因为化学物质一旦发生变化，是不可逆的。
You can't make it better, either, because once chemicals change, they can't be changed back again.
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.
它们对资源的大量开采可能耗尽或不可逆转地破坏森林、土壤、水、空气和气候。
Their surging exploitation of resources threatens to exhaust or unalterably spoil forests, soils, water, air and climate.
他们对资源的不断开发可能会耗尽或不可逆转地破坏森林、土壤、水、空气和气候。
Their increasing exploitation of resources threatens to exhaust or unalterably spoils forests, soils, water, air and climate.
相比之下，最近的世界粮食价格上涨是由趋势造成的，除非趋势本身得以逆转，否则这种上涨是不可逆的。
In contrast, the recent surge in world grain prices is trend-driven, making it unlikely to reverse without a reversal in the trends themselves.
教授：可逆与，不可逆间的边界？
再来看看,不可逆热机的效率。
So now let's look at the efficiency of our irreversible engine.
这种疾病是不可逆转的、递进的。
学生：可逆与不可逆间,有没有边界？
STUDENT: Is there a boundary between reversible and irreversible?
而且有的损失是不可逆转的。
首先，中美合作的历史趋势不可逆转。
First, the historical trend of China-US cooperation is irreversible.
这是一个不可逆转的形势。
这是一个不可逆的过程。
现在的变化则不可逆转。
不，几乎所有的都是要么可逆，要么不可逆。
No, pretty much things are either reversible or irreversible.
不，几乎所有的都是要么可逆，要么不可逆。
No, pretty much things are either reversible or irreversible.
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