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段落1

NARRATOR

Listen to part of a lecture in a biology class.

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段落2

FEMALE PROFESSOR

So... ah... we know animals in many climates have to develop strategies..., uh ways to protect themselves

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when the weather becomes especially hot and dry in the summers.

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Let's start talking about how one small animal-

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a snail-can do this...

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Now, as you know, a snail is a very small creature,

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with a soft, moist body,

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most of which is protected by a hard shell.

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A snail is a good example of an animal that has developed certain strategies

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for coping with high temperatures

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and drought, or lack of water.

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段落3

First to avoid the heat,

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when the sun comes out,

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snails move into the shelter of vegetation...

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uh...ya know... plants or leaves, to get out of the sun and into the shade.

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Now of course, the ground can become very hot in the sun;

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it absorbs and radiates heat,

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so snails will move up off of the ground to places where it is cooler.

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They may attach themselves to a wall...um... or a tree

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where it is cooler than on the ground.

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段落4

Now, it's not just heat that snails need to worry about.

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They also need to avoid drying out due to lack of water...

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so during a really warm, dry day or during the summer months,

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snails secrete a sticky, slimy substance....um...

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made of...ah calcium...

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and it covers the opening of their shell...

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um...covers and closes it up.

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This keeps the moisture inside the shell...

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and prevents the snails from drying out.

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Snails can stay inside their shells closed up like this for a long time... even several months if it's a

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really dry summer.

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Their bodies...well...everything slows down

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and so they don't need food...

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they can survive on what food they've stored up...

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but, when it rains and water is available again,

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the snail opens up its shell to get some.

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