1、Each lung has its own bronchus, which branches into smaller tubes called bronchioles.
每个肺都有自己的支气管, 它分为更小的管道，称为支气管细支。

2、An infection in the bronchus can cause symptoms such as coughing and difficulty breathing.
支气管感染可能导致咳嗽和呼吸困难等症状。