现在，我们倾向于认为鳄鱼是一种孤独的，隐藏在沼泽里的，有点神秘的生物。

Now, we tend to think of crocodiles as kind of solitary, hiding out in a swamp, kind of mysterious creatures.

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这些类似老鼠的生物是哺乳动物中少数（不到5%）有人类一般的一夫一妻制倾向的动物之一。

These mouselike creatures are among the small minority of mammals — less than 5 percent — who share humans’ propensity for monogamy.

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这种污染物很容易在大范围的地理区域内扩散，保持其毒性，并具有在生物脂肪组织内积累的倾向。

The pollutants disperse easily across wide geographic areas, retain their toxicity, and have a tendency to accumulate in the fatty tissues of organisms.

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