Hummingbirds have discovered that nectar and pollen are very nutritious.蜂鸟发现花蜜和花粉是很有营养的.Why do hummingbirds and gorillas both have backbones?为什么蜂鸟和大猩猩都有脊骨?But thoughts eluded her, darting in and out of her mind like frig...
It's only been latterly that we've discovered that it's lots of individual reefs, around about 2,900 separate reef systems which make up the Great Barrier Reef.直到近来我们才发现,它们其实是众多独立的礁石, 大约有2900个独立的礁石系,组成了大堡礁...