backbone road

基本解释

He slipped end-over-end as the gaps in the road, it is a backbone.
涵琯做爲道路中的空隙，它是一個脊梁。
The new road is part of the backbone of China's national highway system, scheduled for completion this year.
新的道路是定於今年完工的全國高速公路主乾網的一部分。
blog.sina.com.cn
The traffic network composed of four lengthwise and three transverse roads has been built in the Base, including one landscape backbone road with planned overall length of 5 km and width of 35 m.
基地內已經建成四縱三橫的道路網架，其中一條爲槼劃全長5公裡，寬爲35米的景觀主乾道。