Because the rv repairtime is still unknown, Marian is nervous about making our final destination on time.
因为RV的修理时间仍旧是未知的，所以Marian对准时到达最终的目的地感到不安。
2
The equipment repairtime is shortened and the labor strength of the workers is reduced after improvement.
改进后，大大缩短了设备检修时间，降低了工人的劳动强度。
3
Some reliability results about equipment and system are derived when breakdown interval and repairtime of every equipment are subjected to exponential distributions.