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

通过润滑，我们的第三类成分祛痰剂，旨在帮助缓解而非消除咳嗽。

If you add some lemon and honey to your water and warm it, this can also help to loosen phlegm and reduce congestion.

如果你在水中入一些柠檬和蜂蜜并热，这也有助于祛痰和减少充血。

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.

愈创甘油常见的祛痰剂，它被认为通过增中的液体分泌物来滋润粘液，使其不那么粘稠，更容易清除。