Birds use warm air currents to help their flight.
鸟利用暖气流助飞。
Birds use thermals to lift them through the air.
鸟类利用上升的暖气流升空。
Why feathered dinosaurs eventually took to the air to become true birds is a mystery.
为什么带有羽翼的恐龙最后跃上蓝天变成了真正的鸟类，至今仍然是个迷。
These are some birds in the air.
空中有几只小鸟。
The birds of the air nest by the waters; they sing among the branches.
天上的飞鸟在水旁住宿，在树枝上啼叫。
Birds swell their feathers with air in order to keep warm.
鸟类的羽毛能凭空气扎煞起来以保暖。
The birds were singing; all the air.
鸟儿在歌唱；整个空中。
And the air is fresh, birds can sing very well.
还有新鲜的空气，歌唱得很好听的鸟儿。
Birds use at least half of the air they take in to cool their bodies.
鸟儿至少要使用它们吸入空气的一半来使自己降温。
So the air is very clean and we can hear birds singing in the trees.
因此，空气很干净，我们可以听到鸟儿在树上歌唱。
The air is still. The bugs and birds are quiet.
空气静止不动。虫子和鸟儿安静不语。
Some birds are flying in the air.
一些鸟正在空中飞。
空中所有的鸟。
The fish swam past me as rapidly as the birds do here in the air.
游在水里的鱼儿在我的耳朵旁滑过去，像这儿的鸟在空中飞过一样。
"If birds and kites can stay up in the air, perhaps we can." they thought.
人们想着：“既然鸟和风筝能呆在空中，或许我们人也能吧。”
鸟在空中飞。
The air was fresh and there were many birds fly in the sky.
空气清新，有许多鸟在天空飞翔。
Thee birds circled around in the air.
䆴鸟在空中绕圈子。
The birds were circling around in the air.
鸟儿在空中绕圈子。
The air is fresh, the sky is blue, and the birds are singing happy songs.
空气是新鲜的，天空是蓝色的，而且鸟正在唱快乐的歌。
When all the birds are singing in the sky. Now the spring in the air.
当所有的鸟儿在天空歌唱，空气中弥漫着春天的气息，到处是漂亮的女孩。
I step outside, smell the air, listen to the birds, meditate, fix myself some pancakes.
到户外区、呼吸空气、倾听鸟儿的歌唱、沉思默想、给自己做几个薄煎饼。
I step outside, smell the air, listen to the birds, meditate, fix myself some pancakes.
到户外区、呼吸空气、倾听鸟儿的歌唱、沉思默想、给自己做几个薄煎饼。
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