人们认为，史前时期的人类穿衣服是为了第四个理由，就是当作一种魔法。
It is thought that prehistoric man wore clothing for a fourth reason, as a kind of magic.
他们的发现表明，在早至史前时期，定居在此的人类不得不面对在冰天雪地的格林兰岛上变化无常的恶劣气候的挑战。
Their findings indicated that earlier, pre-historic settlers also had to contend with vicious swings in climate on icy Greenland.
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