The bronchi and bronchioles are tiny tubes through which air passes in and out of the body.
The bronchi and bronchioles are tiny tubes through which air passes in and out of the body.
支气管和细支气管群是空气进出人体所要经过的微小管道。
The bronchi and bronchioles are tiny tubes through which air passes in and out of the body.
支气管和细支气管群是空气进出人体所要经过的微小管道。