Nature seems to have a bias in favor of balanced pairs — two arms, two legs, two eyes, two ears, two wings.
大自然似乎就是偏爱成双成对的平衡——两只胳膊,两条腿,两只眼睛,两只耳朵,两个翅膀。
The most recent numbers show that Pittsburgh lost almost two thousand people between two thousand seven and two thousand eight.
VOA: special.2009.07.13
Now let's think about designing the experiment itself. The goal here, there are two goals. Or more than two.
那么现在让我们来想想,怎么设计实验本身吧,这里有两个目标,或者多于两个目标。
So, in order to fill our octet, what we do is put two on the nitrogen and two on the carbon.
因此,为了填满我们的“八隅体“,我们需要将两个放到氮上,将另外两个放到碳上。
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