过去许多研究都测量过出自尾气管的二氧化碳的水平。

Many previous studies have measured carbon dioxide levels that come out of exhaust pipes.

youdao

在大多数动物身上，气管和食管是分开的，食管在气管的下面。

In most animals, the trachea (the passage for air) and the esophagus (the passage for food) are oriented such that the esophagus is below the trachea.

youdao

他们发现，这些化合物比目前所用的哮喘药物更有利于肺部气管的舒张。

They found that these compounds all opened lung airways more profoundly than current drugs.

youdao

This last line that I've read seems itself to have been grated on a scrannel pipe.

我读到的最后一行,听起来似乎它本身被细弱的气管声所激怒了。

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