The Kazakh crew had disobeyed instructions, and neither airplane was equipped with collision-avoidance technology.
哈萨克机组人员违反了指令，而两架飞机上都没有配备防相撞技术。
2
During transmission, they employ special collision-avoidance and arrival-acknowledgment techniques that are not required in wired Ethernet LANs.
在传输过程中，他们采用有线以太网不需要的、特殊的避免碰撞和到达应答技术。
3
As the research progresses, Roy says he'd like to add a collision-avoidance system using detectors to prevent the chair from bumping into other wheelchairs, walls or other obstacles.