How many lungs do we have? 我们有多少块肺呢？

　　We have two lungs in our body. 我们有两块肺。

　　Lungs are protected by ribs. 肺由肋骨保护。

　　They are very big. They are about two times as large as one of our feet. 它们都很大——大概是我们脚的两倍大。

　　They take in oxygen from the air and put it into our blood. 它们吸收空气中的氧气，然后输送到我们的血液中

　　We need oxygen to live. 我们需要氧气存活。

　　If you want your lungs to be strong, yuo'd better drink a lot of water. 你若想让自己的肺变得强壮，你最好多喝水。