例句與造句

1. In humans, the trachea divides into the two main bronchi that enter the roots of the lungs.
2. The parietal pleura surrounding the root of the lung extends downwards from the hilum in a fold called the "'pulmonary ligament " '.
3. At the root of the lung, the right superior pulmonary vein lies in front of and a little below the pulmonary artery; the inferior is situated at the lowest part of the lung hilum.
4. It's difficult to find root of the lung in a sentence. 用root of the lung造句挺難的