在加拿大和澳大利亚全球变暖的危害或许已经显现：一连几个暖冬造成了加拿大树皮甲虫成灾，旱灾和大火也使澳大利亚的森林屡遭破坏。
That may already be happening in Canada, where recent warm winters have unleashed a plague of bark beetles, and in Australia, whose forests have been devastated by drought and forest fires.
他们找到一座用树皮和树枝盖的房子。房子上有一棵结满了苹果的大树。
They afterwards came to a little house, made of branches and the bark of trees; a large wild apple-tree bent over it.
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