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1·When the concentration droped to 4%, an irreversible change in the myocardium ultrastructure was obviously observed.

当吸入氧浓度为4%时，心肌超微结构出现明显地不可逆性改变。

2·“We cannot yet be sure that there is an irreversible change in the trend, ” he told a parliamentary debate on joblessness on November18th.

“我们尚不能确定不可逆变化会存在于这种趋势中，”他说在11月18日这天，国会还就失业问题进行了辩论。

3·The report reflects climate scientists' growing fears that Earth is nearing the stage when carbon dioxide rises will bring irreversible change to the planet.

报告反映出气候科学家们对地球正在面临的境况感到日益忧虑，二氧化碳的提升将对这个星期造成不可逆转的改变。

4·Nevertheless, most importantly, the progress is steep invoking irreversible change to the management profession and consequently to the local and global economic environment.

然而，最重要的是，这一变革过程在管理专业上带来了不可逆转的变化，因此当地和全球的经济环境也受到影响。

5·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.

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。

6·The process of political change in South Africa has reached the stage where it is irreversible.

南非的政治变革进程已经到了不可逆转的阶段。《柯林斯英汉双解大词典》

7·She was 26 when she had her tubal ligation, and when I asked why she'd chosen irreversible contraception at such a young age—she's married, what if she and her husband change their minds?

她在26岁的时候就做了输卵管结扎手术，我问她为什么在这么年轻的岁数就选择这种不可挽回的节育方式？---她当时已经结婚，要是她和她丈夫改变了主意怎么办？

8·However even since the 2007 IPCC assessment the evidence for dangerous, long-term and potentially irreversible climate change has strengthened.

然而自从2007年IPCC评估报告以来，危险、长期和潜在不可逆气候变化的相关证据已经变得更加有力。

9·Climate change is essentially irreversible, according to a sobering new scientific study.

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。

10·Any fossil fuel infrastructure built in the next five years will cause irreversible climate change, according to the IEA. Photograph: Rex features.

按照国际能源机构的说法，任何未来五年内建造的化石燃料基础设施都会引起不可逆转的气候变化。