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Flying Birds
飞鸟
Birds don't fly high up in the sky.
鸟在天空中的飞翔高度不高。
The air is too thin. It is hard for birds to breathe in thin air .
空气太薄。鸟类很难呼吸。
Thin air doesn't hold them up.
稀薄的空气并不供给它们足够的氧气。
Birds fly near the ground so that they can see where they are.
鸟儿会靠近地面飞行，这样它们才能了解地面上的情况。
The birds look for places they know. Then they do not get lost.
鸟儿寻找他们知道的地方。他们不会迷路。
Some birds fly so low over the ocean that the waves often hide them.
鸟儿会在海洋上低飞，有时海浪会将它们遮盖住。
Many birds fly long distances in the spring and autumn.
在春天和秋天，许多鸟类的飞行距离会很长。
WORD BANK
词汇表
air
空气
breathe
呼吸
hold
把握，支持
ground
地面
ocean
大海，海洋
wave
波，波浪
distance
距离；遥远
