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But people didn't yet know how to build houses.
但是人們當時還不知道如何建造房屋。
Not a pleasant thought, since at that time it was often intensely cold – at certain periods far colder than today.
一想到這點令人很不愉快，因為在這個時期天氣常常很冷——有時候甚至比現在冷得多。
Winters were longer and summers shorter.
當時冬季更長，夏季更短。
Snow lay deep throughout the year, not only on mountain tops, but down in the valleys as well,
從山頂到深深的谷底，終年覆蓋著積雪，
and glaciers, which were immense in those days, spread far out into the plains.
還有像今天一樣巨大的冰川遠遠向前推進至平原。
This is why we say that the Stone Age began before the last Ice Age had ended.
所以我們說石器時代開始早于最后一個冰河時代。
Prehistoric people must have suffered dreadfully from the cold,
史前時期的人類一定受了嚴寒之苦，
and if they came across a cave where they could shelter from the freezing winds, how happy they must have been!
如果他們偶然發現一個能給他們擋風御寒的山洞，他們一定會高興！
For this reason they are also known as 'cavemen', although they may not have actually lived in caves.
因為這個原因，他們也被稱為為“穴居人”，雖然他們可能實際上沒有住在洞穴里。
Do you know what else these cavemen invented?
你知道這些穴居人還發明了什么嗎？
Can't you guess? They invented talking.
你會想得到嗎？他們發明了說話。
I mean having real conversations with each other, using words.
我指的是互相用詞語進行真真正正的交流。
