主動脈系統血管的主幹道，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.
樹一種多年生木質植物，生有一個主幹且常有一個很明顯的樹冠
A perennial woody plant having a main trunk and usually a distinct crown.
高峰時間最好避免走主幹道，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.
這個飯店處於兩條主幹道的交接處，很喧嘩。
The hotel is noisy as it stands at the cross of two main roads.
