林下鸟
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"These very specialized birds feed only in the forest understory," he explains. "they're so adapted, and feel so safe, they won't leave."
“这些非常特别的鸟类只存活在森林次冠层叶簇中，”他解释说，“它们如此地适应了那种环境，而且感觉如此得安全，因而它们不会离开那里。”
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