The fact that the valve is absent in the lymphatic vessel under the external membrane of both the bronchiole and the arteriole of related to the terminal bronchiolus shows that the lymphatic vessel farther off is capillary. 与终末细支气管同行的小动脉外膜下淋巴管,以及细支气管外膜下的淋巴管腔内,未见瓣膜;自该级以远的淋巴管为毛细管性。
The bronchiolus of almost all ill or dead chickens were full of cheese substances and obstructed, and serious hemorrhage of trachea and bronchial mucous membrane could also be seen. 通过病理剖检,几乎所有病死鸡支气管都充满干酪样物质,导致支气管严重阻塞,气管及支气管黏膜严重出血。