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首先阅读全文,然后通过常识判断和文章前后文去判断有下划线的单词的意思。 Hummingbirds: A Portrait of the Animal World The hummingbird is truly extraordinary. It is, of course, most famous for its diminutive size; even the largest of these little birds weighs barely half an ounce; the tiniest, at barely two inches long, is the smallest of all warm-blooded creatures. But the hummingbird is notable for many other reasons. Its ability to hover , seemingly motionless, in midair and even to fly upside down is amazing. Its vividly hued iridescent plumage gives it a remarkable appearance. And its specialized feeding habits, its extraordinary migration patterns, and its unusual courtship and mating rituals make it unique in the realm of ornithology . diminutive: notable: hover: unique: ornithology: