Finally, in the bronchi, but not the bronchioles, there is also a layer of cartilage below the submucosa which stiffens the bronchus and helps to keep it open.

最后，在某些支气管中，黏液下层之下还有一层软骨；这些软骨可以使支气管变硬并且保持开放。

Have you tried to intubate her left bronchus?

有没有试过插管进左支气管？

In the region of the mediastinum, the trachea divides into two branches called bronchi. Each bronchus leads to a separate lung and divides and subdivides into smaller and finer tubes, somewhat like the branches of a tree.

在纵隔区域，气管分为两个分支，称为支气管。每个支气管通向一个单独的肺部并逐级分支，形成一级比一级细小的管道，有点像树枝。