But birds never fly too high, because the air in the high sky is too thin, they can not live in thin air.
但是，鸟们不能飞太高，因为高空的空气稀薄，他们在稀薄的空气里无法生存。
The eagle is a kind of high in the blue sky on the fly as birds.
鹰是一种能在很高的蓝天上飞翔的强悍鸟类。
The eagle is a kind of high in the blue sky on the fly as birds.
鹰是一种能在很高的蓝天上飞翔的强悍鸟类。
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