The mainstem bronchi then divide into smaller and smaller bronchi.

支气管会反复分支成小支气管。

Now, once air makes it's way into the larynx, it then continues down as the trachea or the windpipe, which splits into the two mainstem bronchi.

而一旦空气进入咽喉，接下来就是气管，延伸为两侧的支气管。