主動(dòng)脈系統血管的主干道，將血液由心臟左側輸送到除肺部以外的所有肢體及器官的動(dòng)脈里
The main trunk of the systemic arteries, carrying blood from the left side of the heart to the arteries of all limbs and organs except the lungs.
樹(shù)一種多年生木質(zhì)植物，生有一個(gè)主干且常有一個(gè)很明顯的樹(shù)冠
A perennial woody plant having a main trunk and usually a distinct crown.
高峰時(shí)間最好避免走主干道，一直要等到交通擁擠狀況完全消除后才行。
At busy times, it's best to avoid the main roads, and remain clear of them until the worst of the traffic is over.
這個(gè)飯店處于兩條主干道的交接處，很喧嘩。
The hotel is noisy as it stands at the cross of two main roads.
