Hummingbirds have discovered that nectar and pollen are very nutritious.
蜂鸟发现
蜜和粉是很有营
。
Hummingbirds have discovered that nectar and pollen are very nutritious.
蜂鸟发现蜜和粉是很有营。
Nectar and pollen are very nutritious.
蜜和粉是很有营。
声
：以上例句、词性分类均由互
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