Backbone Subsystem干线子系统;垂直干线子系统;子系统;主干子系统
collapsed backbone紧缩主干;集中式主干网;紧缩主干网;式主干
backbone road干道;主干道
backbone structure主链结构;基干结构
Backbone Networks骨干网络
virtual backbone虚拟骨干;虚拟骨干网
interbuilding backbone楼宇干线;楼宇
interwinding backbone楼宇;互绕电容
multicast backbone多播主干网;多址传播骨干网;主干网
N-COUNT（可数名词） Your backbone is the column of small linked bones down the middle of your back. 脊骨
N-UNCOUNT（不可数名词） If you say that someone has no backbone, you think that they do not have the courage to do things which need to be done. 骨气 [oft with brd-neg]
You might be taking drastic measures and you've got to have the backbone to do that.
你可能在采取极端措施，而且你得有骨气做它。