spare cable

基本解釋

The spare cable or control cable that is normally not loaded with current shall be placed at the center in case of multi-layer laying.
多層敷設(shè)時，平時不載流的備用電纜或控制電纜應(yīng)放置在中心部位。
The fixed pulley is rotated by a cranking bar to wind the steel cable, a spare tire can be lifted, and the spare tire can be put down stably by rotating in reversal the cranking bar.
使用搖把轉(zhuǎn)動定滑輪圈繞鋼絲索，即可提升備胎，反轉(zhuǎn)搖把即可平穩(wěn)降下備胎。
ip.com
"In the worst case, the carrier cable may fail and the spare tire could become separated from the vehicle, a road hazard for following vehicles that increases the likelihood of a crash, " it said.
“最壞的情況是，載波電纜可能會失效，備用輪胎就有可能從車上脫落，給后續(xù)車輛造成危險，從而增加了發(fā)生車禍的可能性。”報告中說。
treasure.1x1y.com.cn

The theory was to spare cable operators the time and expense of negotiating licenses with the myriad owners of content that was being broadcast over the air.
FORBES: Court Calls Streaming-Video Service IVI A Deadly Threat To TV
Yes, there was more on display, but we've decided to spare you the sight of every walkie-talkie, cable modem, set-top box and cellphone in Moto's lineup.
ENGADGET: Motorola's CES booth tour