主动脉是大血管，当它将血液泵入较小的血管时，小血管可产生较高阻力。
And because the aorta is a big tube and its pumping blood out into smaller tubes, the smaller tubes are of course going to have higher resistance.
感染性心内膜炎：见主动脉瓣处有一大而不规则的红褐色赘生物。
This is infective endocarditis. The aortic valve demonstrates a large, irregular, reddish tan vegetation.
主动脉夹层，一种病情凶险、死亡率较高的急性大血管病变，已引起国内外学者对发病机制、诊断治疗的深入研究。
Aortic dissection is an acute process of large blood vessels characterized by dangerous pathogenic conditions and high fatality, which has attracted extensive study.
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