primary bronchus的用法和样例：
例句
- Four days after seeding, the graft was used to replace the patient's left main bronchus.
种植完成四天后，该移植物被用来替换患者的左主支气管。 - Conclusions Resection and reconstruction of tracheal carina and main bronchus may increase resection rates of central type lung carcinoma and achieve excellent long-term survival.
结论气管隆突主支气管切除成形手术提高了中心型肺癌的手术切除率，并取得满意的治疗效果。
