尽管鸟类体型大小和年龄有关，然而很多时候大小差异是多种鸟类唯一的体貌区别。

While birds will vary in size based on age, many times size is the only physical difference in birds.

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在一种模拟的情景中，一个与天王星大小差不多的行星处在一个星球的可栖居的地带，不冷不热，并且周围有一个地球大小的恒星。

In one simulation, a planet with the mass of Neptune situated in the habitable zone of a star - not too hot, not too cold - was given a moon the size of Earth.

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“或者可能跟一只狗的大小差不多。”弗朗茨又说。

"Or maybe it was only as big as a dog," Franz said.

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