名词
中文翻译：自然群体
同义词：
['natural congregation', 'natural gathering']
例句：
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1.The group of birds is forming a natural swarm to avoid predators.
这群鸟正在形成自然的群集来躲避捕食者。
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2.The scientists observed the natural swarm of bees as they pollinated the flowers.
科学家们观察到蜜蜂的自然群集，它们在花朵上授粉。
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3.The swarm of bees was so large that it blocked the view of the observer.
蜜蜂的群集非常大，以至于挡住了观察者的视界。