aortic knob

例句：

1. 1. The doctor performed an operation to replace the aortic knob.
   医生进行了一次手术来替换主动脉瓣。
2. 2.Aortic cusps are the two main parts of the heart that help pump blood.
   主动脉瓣是心脏的两个主要部分，帮助泵血。
3. 3. The patient was diagnosed with aortic valve disease and required surgery.
   患者被诊断出患有主动脉瓣疾病，需要手术。