One of the major air tubes in the lung. The trachea divides into two main bronchi, one for each lung, which split into smaller bronchi and then into bronchioles. The walls of the bronchi are stiffened by rings of cartilage.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。