trunk main的用法和樣例：
例句
- We have been wired into the main system now.
我們現在已經與輸電幹線接通了。 - It all fit easily into the trunk of the cruiser.
這一切都適合容易進入幹線的巡洋艦。 - You must reverse the car and go back to the main road.
你應該把車倒過頭來回到主幹線上去。 - This air line operates five main lines and twenty branch lines.
這家航空公司經營五條主幹線和二十條支線。
