After rain, the air smells like earth.
雨下过以后，空气里有股泥土香。
That smell is not just wet dirt.
那股味道，可不只是湿泥巴。
Tiny bacteria in soil make a special smell.
泥土里的小细菌，会放出特别的味道。
The smell has a fancy name: geosmin.
它有个洋气的名字，叫土臭素。
Dry soil keeps it locked inside.
泥土干的时候，味道被锁在里面。
Raindrops pop it out into the air.
雨点一打，它就被蹦到了空气里。
Your nose can smell it really well.
人的鼻子闻它，灵得不得了。
