Smooth muscle along the trachea and the first few branches of bronchi have beta 2 adrenergic receptors.

和初级支分支的平滑肌上，都有β2受体。

It goes down past the trachea and main bronchi to eventually reach the bronchioles - it’s primary target.

经过和主支后，病毒最终到达其主要目标细支。

Have you tried to intubate her left bronchus?

有没有试过插进左支？

Chronic bacterial infection and inflammation can lead to bronchiectasis, which is airway wall damage causing permanent dilation of the bronchi.

长期细菌感染和炎症可以致支炎，即道壁被破坏致支的永久性扩张。

The actions of these cohorts eventually led to severe pulmonary haemorrhage and necrosis – or tissue death – within the bronchi.

这团伙行动最终致了严重的肺出血和支内的坏死——或组织死亡。

The mainstem bronchi then divide into smaller and smaller bronchi.

支会反复分支成小支。

Others in such high-risk areas as the walls of the bronchi and the intestines remove certain bacteria and shattered cells.

我们对疾病产生免疫力 身体处感染有其特殊的方法。它有一个系统，能够一开始就阻止感染性物质的侵袭，然后通过" 记忆" ，它能给身体—个长久的免疫力来抵抗来自将来侵者的侵袭。

Once the measles virus gets onto the mucosa of an unsuspecting person, it quickly starts to infect the epithelial cells in the trachea or bronchi.

一旦麻疹病毒进一个毫无戒备的人的粘膜，它很快就会开始感染或支上皮细胞。

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，在某些支中，黏液下层之下还有一层软骨；这些软骨可以使支变硬并且保持开放。

The lower respiratory system begins with the larynx, or voice box, and includes the trachea, or wind pipe, bronchi, bronchioles, and alveoli within the lungs.

下呼吸系统始于喉、也可称音箱，并且包括，也可称风，支，细支和肺内的肺泡。

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.

而一旦空进咽喉，接下来就是，延伸为两侧的支。

During inhalation, air reaches your lungs by traveling down your trachea, then it continues through the bronchi and the bronchioles and ends up in the alveoli.

吸时，空通过进肺部，然后继续穿过支和细支，最后进肺泡。

The trachea is part of the conducting zone, and it branches into right and left primary bronchi, carrying air to and from the right and left lung, respectively.

是传区的一部分，并且它分支出右和左主支，它们运载体进出相应的肺。

So if we take a look at the lungs, you've got the trachea which branches off into the right and left bronchi and then continues to branch into thousands of bronchioles.

所以，如果我们看一下肺：这是，它会分支到右和左支，然后继续延伸到成千上万的细支。

It is helpful to think of the lower respiratory system as being like an upside-down tree, where the trachea is the trunk, the bronchi are the branches, and the alveoli are the leaves.

把下呼吸系统想成一个倒着的树，是树干，支是树分支，肺泡是叶子。

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，分为两个分支，称为支。每个支通向一个单独的肺部并逐级分支，形成一级比一级细小的道，有点像树枝。