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旁白：现在听一下生物课上的一节课。

Narrator: Now listen to part of a lecture in a Biology class.

教授：现在很多海洋动物为了躲避捕食者，随着时间的推移，会开发出不同种类的伪装来帮助它们融入环境，避免被捕食者发现。

Professor: Now many sea animals, in order to hide from predators, have over time develop different kinds of camouflage to help them blend in with their environment and avoid detection by predators.

它和我们生活的土地一样多种多样。

一些海洋动物已经形成了永久的颜色或形状，与这些环境特征相似。

and some sea animals have developed permanent colors or shapes to resemble these environmental features.

这种伪装有助于将它们伪装成海洋的特定部分，从而使它们免受捕食者的伤害。

This camouflage helps disguise them from predators by enabling them to blend into a specific part of the sea.

例如，吃一种像叶海龙一样的鱼。

For instance, take a kind of fish like the leafy seadragon.

它就像一条绿色的小龙，长着叶子一样的突起，像手臂一样伸出来。

It resembles a small, green dragon with leaflike protrusions sticking out like arms.

它与绿色的海洋植物非常好地融合在一起。

it blends in extremely well with green sea plants.

所以当叶海龙在这些植物中游动时，

So when the leafy seadragon is swimming through these plants,

但是当它进入其他环境时没有这些绿色植物，

But when it enters other environments without these green plants,

现在，其它海洋动物很难在海洋的任何地方发现，因为它们的伪装使它们能够改变颜色。

Now other sea animals are difficult to spot anywhere in the sea, because their type of camouflage enables them to change color.

就拿墨鱼来说，这是一种与鱿鱼和章鱼密切相关的鱼。

Take the cuttlefish, a fish that is closely related to the squid and octopus.

墨鱼还没有形成任何特别的形状来躲避捕食者。

cuttlefish have not developed any particular shape to hide from predators.

但是他们有更多的机动性因为他们的伪装使他们能够融入任何环境，

But they have a lot more mobility because their camouflage allows them to blend into any environment,

因为墨鱼的色素会改变颜色，让它们在几秒钟内改变颜色，

because cuttlefish have shifting pigments that allow them to change color in a matter of seconds,

所以它们几乎可以瞬间匹配周围环境的颜色。

and so they can almost instantaneously match the color of their surroundings.

如果他们在绿色的海洋植物中游泳，

and if they're swimming over the brown sea floor,

<img src="/upload/ti/2426000-2427000/2426982/9060807b95ba4014a66cfa144ed4c3d8.jpg">
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 Using the examples of the leafy sea dragon and the cuttlefish, describe two kinds of camouflage and the benefits they provide.&nbsp;
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