Birds don't fly high up in the sky.鳥不飛高掛天空。
The air is too thin. It is hard for birds to breathe in thin air .空氣太薄。它是困難的對于鳥類呼吸稀薄的空氣中。
Thin air doesn't hold them up.稀薄的空氣并不持有它們。
Birds fly near the ground so that they can see where they are. 鳥兒飛近地面,這樣他們可以看到他們在哪里。
The birds look for places they know. Then they do not get lost.鳥兒尋找地方他們知道。然后他們不迷路。
Some birds fly so low over the ocean that the waves often hide them. 有些鳥飛如此低的海洋,海浪常常隱藏他們。
Many birds fly long distances in the spring and autumn.許多鳥飛很長的距離在春天和秋天。
WORD BANK
air/ea/n.空氣
breathe/bri:?/v.呼吸
hold v.把握,支持
ground n.地面
ocean n.大海,海洋
wave/weiv/n.波,波浪
aistanee n.距離;
遙遠