年年都会咳嗽、支气管内层也会分泌黏液，持续时间一次比一次久。

The coughing and mucus production can return each year and can last longer each time.

youdao

年年都会咳嗽、支气管内层也会分泌黏液，持续时间一次比一次久。

The coughing and mucus production can return each year and can last longer each time.

youdao