Rather, mucus tends to occur as ropy strands of secretion exuded from the mural bronchialmucus glands.
说得更恰当一点，粘液是壁状支气管粘液腺渗出的分泌物，呈胶粘体存在。
2
It is possible that Jerry had a congenital anomaly in his bronchial tree that led to the pooling of mucus, and eventually to infection, but it is impossible to know for certain.
Jerry有可能是先天性支气管异常导致粘液的蓄积导致最终感染，但很难验证这种情况。
3
This cast of the bronchial tree is formed of inspissated mucus and was coughed up by a patient during an asthmatic attack.