The ape shoulder is good for hanging from a tree, but when our ancestors started walking on two legs, the shoulder started to change.

猿猴的肩膀有利于其在吊在树上，但是当我们的祖先开始以两条腿走路以后，猿猴的肩膀也开始发生变化。

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When you find yourself off a trail, but not in a completely unfamiliar area of land, you have to answer two questions: Which way is downhill, in this particular area?

当发现自己偏离路线，但又并非身处完全陌生的区域时，你要回答两个问题：在这片区域，哪边是下坡方向？

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However, when two monkeys were placed in separate but adjoining chambers, so that each could observe what the other was getting in return for its rock, their behavior became markedly different.

然而，当两只猴子被放置在不同但相邻的房间里，以便让它们观察到对方用石头换来了什么时，它们的行为就变得明显不同了。

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But when electoral votes were counted, he got two hundred twelve to McClellan's twenty-one.

VOA: special.2009.12.10

I should have read it a lecture or two ago when I started talking about immortality, but I misplaced it.

我应该在一两节课之前读它,即在我开始谈论永生的时候，但是我当时把它放错地方了。

耶鲁公开课 - 死亡课程节选

We can do the exact same thing when we talk about lithium, but now instead of breaking it up into two wave functions, we're breaking it up into three wave functions because we have three electrons.

在讨论锂时,我们也可以做，完全相同的事情,但不是把它分为两个波函数，而是分为三个波函数,因为我们有3个电子。

麻省理工公开课 - 化学原理课程节选

But when two pieces of food were placed at separate exit points in the labyrinth, the organism squeezed its entire body between the two nutrients.

BBC: When slime is not so thick

But when two sides are this far apart, anything is possible.

FORBES: NBA Owners Are Inflating Loss Estimates, But They're Likely To Win Labor Battle

But when the two finally did sit down eyeball-to-eyeball in Baghdad, it was the Iranians who seemed keener on diplomacy.

ECONOMIST: No one knows if the latest talks will lead anywhere