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'.

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。”

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Self-awareness, even in its earliest stages, might entail an awareness of others, the ability to see their perspective, to look at the world from another's point of view.

自我意识，即使在它的最初阶段，也可能需要他人意识，即从他人的角度看世界的能力。

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Some scientists speculate that Mars may have enjoyed an extended early period during which rivers, lakes, and perhaps even oceans adorned its surface.

一些科学家推测，火星在早期很长时间里可能都有以河流、湖泊，甚至海洋装点着它的表面。

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The South as an idea, the South and its distinctiveness was very much there even in the Colonial Period.

南方作为一个概念,指南方地区以及其特点,早在殖民时期就已经存在

耶鲁公开课 - 美国内战与重建课程节选

So even if we strip an atom of all of its electrons, we still have that same amount of positive charge in the nucleus.

所以即使把一个原子的所有电子都拿走,原子核还是带那么多的正电。

麻省理工公开课 - 化学原理课程节选

It will be interesting to see how Dell balances this independence with its ambition to build an even larger portfolio of technology to solve even more problems for its customers.

FORBES: Implications of Michael Dell's Vision for the New Role of the CIO

The country would almost certainly reintroduce the drachma, which would devalue dramatically and quickly, making it even harder for Greece to repay its debts, and setting an even worse precedent.

BBC: Eurozone crisis explained

Even in its present muscular mood, even with its present unchallenged power, an America that is asked to do the impossible, or which promises it, is bound to disappoint.

ECONOMIST: Bali, Iraq and now a nuclear North Korea