adj.主要的;
n.主管道;水源;(水等)供应系统;
例句:
Inflation is the Government's main bugbear.
通货膨胀是政府的主要难题.
It's time to serve up the main course.
该上主菜了.
If you keep to the main road you won't get lost.
假如你沿着主干道走,就不会迷路.