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But how did one man and a spear produce the huge force behind this blow? The answer lies with small bits of ivory like this. They were once part of an atlatl, or spear thrower. An atlatl acts as a sort of catapult, magnifying the strength of a hunter's throw, allowing him to launch a spear up to 200 metres, with enough power to drive the point through a bison skull. It's this kind of sophisticated technology that helped these early North Americans to spread throughout the entire continent.
但是一个人怎么能仅用一支矛就产生这么大的力？答案就藏在这样的小片象牙里。他们是梭标投射器的一部分，梭标投射器是用来投掷矛的，它就像是弹弓一样，可以增加猎人投掷的力量，这使猎人能将矛投掷到200米外，力量强到可以穿过北美野牛的头骨。早期的北美人便是利用这种高端技术在整块大陆上生存繁衍。
But what else did they find once they reached Florida? Florida's ice age wildlife was remarkably rich and diverse. There were many familiar animals, normally found further north, but also creatures unique to the tropics. The result was a mixture of species unlike anything we see today and an abundant food source for the human immigrants.
但是当他们来到佛罗里达后还发现了什么？冰河时代的佛罗里达动物物种极其丰富多样。在更北边，生存着许多类似的动物，但是这些动物相对于热带地区也十分独特。结果我们发现了很多如今我们看不到的物种，同时还有对于人类迁徙者来说丰富的食物来源。
So what produced ice age Florida's wealth of wildlife? Part of the answer comes from the ice itself.
那么是什么孕育了冰河时代佛罗里达丰富的物种？一部分原因正是因为那是在冰河时代。
At the peak of the last ice age, massive glaciers up to 2 miles thick covered over half the North American continent. The ice destroyed the habitat over which it lay, but it also had a profound impact on regions far away. It created a domino effect that rippled down the continent.
在冰河时代的顶峰时期，大面积的冰川厚达2英里，覆盖了北美大陆的一半以上，冰川摧毁了冰下动物们的栖息地，但是对于远距离的地区却产生了深远影响。它产生的多米诺效应蔓延到了整个大陆。
英文文本来自普特英语，译文属可可原创，仅供学习交流使用，未经许可不得转载.
