树上有几千只成群的蜜蜂。

There were thousands of bees in swarms in the tree.

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适应寒冷天气的一个方法就是改变自己的习性：蜜蜂在蜂巢内挤在一起，鸟类成群飞翔以减少散热。

One way of dealing with colder weather is to alter one's behaviour: honey bees huddle together in their hives, and birds flock together to reduce heat loss.

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成群结队的蜜蜂在一起酿蜜，它们付出这样大的辛劳并不是为自己，而是因为它们酿出的蜜可以为整个群体而非个人所享用。

Groups of bees work together to produce honey. Their great efforts are not selfish, however, as the amount of honey they produce is for an entire group rather than a single individual.

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