over the past billions of years
在过去的数十亿年里
many animals and plants
许多动植物
have lived on this beautiful planet
生活在这个美丽的星球上
But about 99.9 perfect of them died out.
但大约99.9完美无缺的它们灭绝了
this is because
这是因为
they couldn't adapt to where they lived
它们不能适应自己生活的地方
to survive
为了生存
living things must change over time
必须随着时间的推移而改变
This is called evolution.
这就是进化
When reading this article, please remember that every one of us is a lucky dog.
请记住，我们每个人都是一只幸运的人儿。
We evolve , and we survive!
我们进化，我们生存！
after years of evolution
经过多年的进化
have the abilities to live in the world and enjoy it
我们有能力生活在这个世界上并享受它
just like humans
就像人类一样
other animals on Earth
地球上的其他动物
also evolve great abilities
也进化出巨大的能力
giraffes live on the grasslands of Africa
长颈鹿生活在非洲的草原上
to adapt to life there
为了适应那里的生活
they have evolved longer necks to reach the high trees
它们已进化出了更长的脖子，可以伸展到高大的树木上
as well as longer legs to run away from lions and cheetahs
也进化出了更长的腿，以躲避狮子和猎豹
However, evolution also gives giraffes a strange habit: They only sleep for about 30 minutes a day and less than 5 minutes a time.
然而，进化也给了长颈鹿一个奇怪的习惯：它们每天只睡大约30分钟，一次不到5分钟。
sleep standing
站着睡觉
Why are they so wakeful?
他们为什么这么警觉？
that's because they are so tall
那是因为他们太高
need longer time getting off the groundand and run
需要更长的时间离开地面并奔跑
because of this unique sleep style
由于这种独特的睡眠方式
they won't become easy meals for others
它们不会成为其他人的便餐
As you see, evolution isn't always perfect.
如你所见，进化并不总是完美的。
helps animals to live
帮助动物生存
sometimes also gives them what they don't really want
有时也会给他们带来他们并不真正想要的东西
Don't feel sorry. It's part of natural selection . In order to survive, all of this is reasonable.别觉得遗憾。这是自然选择的一部分。为了生存，所有这些都是合理的。
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