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1·The lungs consist of millions of tiny air sacs.

肺包含数百万个小肺泡。《柯林斯英汉双解大词典》

2·Anatomically precise support for the heel and ankle, air sacs for extra spring and comfort each year bring apparent new refinements.

在结构上来说，对脚跟和脚踝的恰好支撑，还有气囊带来的额外弹性和舒适度，每年都会有明显的改进。

3·Once it gets in a person's lungs, the alveoli, or air sacs that take in oxygen, swell and fill up with fluid.

一旦病原体进入肺部，肺泡(类似吸入氧气的气囊)就会肿胀并充满积液。

4·The air sacs are surrounded by a dense network of minute blood vessels, or capillaries, which connect to the heart.

这些气囊被连接着心脏的浓密的毛细血管网包围着。

5·Instead, birds have a complex network of air sacs that work like bellows to pump a constant stream of air through the lungs.

相反地，鸟类有一个复杂的肺泡结构，就像一个风箱把源源不断的空气打进肺里。

6·Yep, Plus the air sacs mean that birds weigh less than you'd expect, which makes flying less costly in terms of energy.

是的。加上肺泡的话就说明鸟比我们想象的要轻，那样飞行就不会那么耗能量。

7·This showed that noises made from tubes without air sacs, the tubes mimicking the modern vocal tract, were much clearer.

实验显示，没有气囊的管子发出的声音更为清晰，而这种管子模拟的正是现代人类的声道。

8·This week amniotic fluid is helping the air sacs in your baby's lungs get ready for breathing as she practices inhaling and exhaling.

这周，当婴儿羊水会帮助肺部的肺泡为慢慢的呼吸做好准备。

9·This week, amniotic fluid is helping the air sacs in your baby's lungs get ready for breathing as she practices inhaling and exhaling.

这周，当婴儿羊水会帮助肺部的肺泡为慢慢的呼吸做好准备。

10·More sounds meant more information could be Shared, giving those who lacked air sacs a better chance of survival in a dangerous world.

声音增多意味着可以分享的信息增多，这使得那些没有气囊的祖先在危险环境里的生存几率大大增加。