trunk main

• 干线

trunk main的用法和样例：

例句

1. We have been wired into the main system now.
   我们现在已经与输电干线接通了。
2. It all fit easily into the trunk of the cruiser.
   这一切都适合容易进入干线的巡洋舰。
3. You must reverse the car and go back to the main road.
   你应该把车倒过头来回到主干线上去。
4. This air line operates five main lines and twenty branch lines.
   这家航空公司经营五条主干线和二十条支线。