The airway tube extends from a proximal end to a distal end. The airway tube defines an internal passage.

从近端延伸到远端的通气道管，所述通气道管限定内部通道；

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It is only when we complete our internal process and reaches a certain level of purification that we are granted passage into the next realm.

只有当我们完成了我们内在的过程，并且到达了一定层次的净化之后，我们才可以进入到下一个次元。

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On his return, he reduced Apple's bloated computer product range from about 40 to just 4. This passage, set in an internal meeting, describes how he did it.

他一回来，就把苹果公司膨胀的产品线从40个减到4个。

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Canada claims the passage, which links the Pacific and Atlantic Oceans, runs through its internal waterways.

CNN: China eyes Arctic options in energy, transport