科普什麼是自然選擇（雙語）

Natural selection, survival of the fittest.

物競天擇，適者生存。

Natural selection can be seen in the story of the long neck giraffe.

長脖子長頸鹿的故事體現自然選擇。

The long neck is an adaptation.

長脖子是一種適應。

This helped the gariffe to survive for millions of years.

這幫助長頸鹿存活了數百萬年

An adaptation is a trait or behavior helping an organism survive.

適應性是一種幫助有機體生存的特質或行為。

Giraffe didn't always have long necks

長脖子並不是有長脖子

Within a species there are variations.

在一個物種記憶體在變異。

Some giraffes have long necks and some giraffes have short necks

有些長頸鹿有長脖子，有些則相反。

Having a long neck helps the giraffe obtain food.

長脖子對長頸鹿有好處。

If a giraffe had a short neck, it's going to have a difficult time getting the leaves that it needs to survive.

如果長頸鹿的脖子很短，將很難獲得生存所需的樹葉。

Over time, the short neck giraffes begin to fade out, because they cannot obtain the food that they need to survive.

隨之時間的推移，短徑長頸鹿開始逐漸消失，因為他們無法獲得生存所需的食物。

This leaves only long neck giraffes.

這樣就只剩下了長脖子的長頸鹿了

And when two long neck giraffes survive, they're going to fall in love, reproduce and pass on the traits to their offspring.

當兩隻長頸長頸鹿存活下來，它們就會墜入愛河，繁殖後天，並將這些特質遺傳給後代。

And trait being passed on is the trait of having a long neck.

遺傳的特質就是常脖子

So natural selection.

所以，這就是自然選擇。

It is surviving, then passing helpful traits on to your offspring.

自然選擇關乎生存，然後把有益的特質傳給後臺。

Natural selection.

自然選擇。