However exploration of Australasia introduced Europeans to black swans.
然而,澳大拉西亚的探险给欧洲人带来了黑天鹅.
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Following the introduction of a small mouse quickly hedgehogs, turtles and swans.
继小老鼠后迅速推出刺猬 、 乌龟及天鹅.
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Since 1990 s, we can see swans come to Summer Palace every year.
据了解,从20世纪90年代初开始, 在颐和园每年都能看见“落脚”的白天鹅.
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