求翻译：这种鞋子最初名字的来由叫ugly boots（意思丑陋的鞋子），后来澳洲人昵称它为“UGG”。UGG靴子是一战时期在澳洲兴起的，澳大利亚飞行员用两块羊皮包裹成鞋子穿在脚上御寒，后来逐渐在澳洲流行开来。是什么意思？

This shoe was originally a name of origin called ugly boots (mean ugly shoes), later Australian nickname it "UGG". UGG boots is the rise in Australia during the period of world war I, Australia pilot overlaid with two pieces of sheepskin shoes on my feet warm, then gradually popular in Australia.