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Suppose you are an animal. Well, actually, you are an animal, but suppose you’re another kind of animal, maybe something small that might make a tasty snack for a larger predator. You’re walking along one day when you see a big dog. What do you do? 假设你是一只动物。额，你其实本来就是一只动物。但假设你是另外一种动物，也许是一种可以被食肉动物当成可口点心的小动物。如果有一天你在独自散步时看到一条大狗，你会怎么办？ Well, depending on what kind of animal you are, you have different options. A skunk can spray a noxious liquid that will repel predators, a cat can make its hair stand on end so that it seems larger than it is, or some animals, such as opossums, may pretend to be dead already. 好吧，这取决于你是哪种动物，你有不同的选择。一只臭鼬可以释放毒液击退捕食者，一只猫可以让它的毛发倒竖起来，让它看起来比往常更大，还有一些动物，比如负鼠，也许早已装死躺在地上了。 There’s another strategy all these animals have, though. You’ve seen it before, but maybe never thought about it. They can freeze. 其实这些动物还有另外一条策略，虽然你可能以前见过，但也许你从来没想到过。它们可以冻结。 When a squirrel or a rabbit or a chipmunk freezes, it can remain almost entirely motionless for minutes at a time. Try it yourself. Whatever position you’re in right now, move nothing at all for the next minute. It’s not so easy! 当一只松鼠，兔子或花栗鼠冻结时，它可以一次保持完全静止不动达数分钟之久。你自己试试。不管你现在是什么姿势，在下一分钟内保持一动也不动。这可没那么简单！ | 
