By lubricating airways, our third class of ingredients, expectorants, aim to help improve coughing rather than eliminate it.

通过润滑呼吸道，我们的第三类成分祛痰剂，助缓解而非消除咳嗽。

STEP 2 Drink licorice tea. Licorice root is an expectorant that breaks up mucus in the nose and the lungs, so you'll breathe more easily.

喝草茶。草根是一种化痰剂，可以分解鼻腔和肺里的，样呼吸就更容易。

Guaifenesin, the most common expectorant, is thought to hydrate mucus by upping fluid secretions in the respiratory tract, making it less sticky and easier to clear out.

愈创油醚是最常见的祛痰剂，它被认为是通过增加呼吸道中的体分泌物来滋润，使其不那么稠，更容易清除。