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n. 重力，严重，庄重，严肃
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Work book Unit one Listening
Many animals and plants have developed ways to solve problems that are similar to the ones we humans have to deal with.
Part One
Scientists often look at nature in order to find new ideas.
In ancient times,Chinese scientists studied how spiders made silk.
Modern scientists are interested in the spider too.
The spider can make silk that is much stronger than most man-made materials.
Spider silk doesn't break easily,instead of breaking,it gets longer.
Best of all,
the spider produces the silk without the use of dangerous or poisonous chemicals
If we could learn to use the technique,
we might be able to use the strong silk to make things like seat-belts and wires that hold up bridges.
Part Two
There are many other examples of how new technology has been developed by learning from nature.
A group of German scientists wanted to find out why leaves and flowers are able to stay so clean.
They decided to take a closer look at the white lotus,
a flower that is know for it's cleaning leaves.
At first,the scientists believe that the very flat leaf
would be better with stain clean.
However,when they looked closely at the white lotus,
the scientists saw that the leaf was in fact covered with tiny hairs and needles.
The needles and hairs collect the dust that falls on the leaf.
So that a rain drop can easily wash it out.
The German scientists use this technic to design a new kind of paint.
The new paint could keep out as looking clean for years.
Scientists also believe
that the butterfly could teach us a way to keep our computers cool.
A computer must be kept cool to function well.
The fans we use today are not always good enough.
The butterfly is cold-blooded and must change its body temperature all the time.
Scientists have found that there are small parts on the two wings
of the butterfly uses to change its temperature.
If scientists can learn how it has done,
it maybe possible to use the same method to keep computers from becoming too hot.
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