"There are three hydraulic systems on 737, system A and system B are full-time operating systems during flight that share responsibility for all hydraulically powered components.The standby system is operated only on the ground ." The above sentence means
"There are three hydraulic systems on 737, system A and system B are full-time operating systems during flight that share responsibility for all hydraulically powered components.The standby system is operated only on the ground ." The above sentence means“波音737装有三个单独的液压系统，飞行中，A系统和B系统总是处于工作状态，共同负责所有液压部件的操纵。备用系统只在地面操作时启动。”
