Hummingbirds have discovered that nectar and pollen are very nutritious.
蜂鸟发现花蜜和花粉是
有
养的。
Hummingbirds have discovered that nectar and pollen are very nutritious.
蜂鸟发现花蜜和花粉是有养的。
Nectar and pollen are very nutritious.
花蜜和花粉是有养的。
声
：以上例
、词
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