Drivers must be on the alert for traffic signals.驾驶员必须密切注意交通信号.They were constantly on the alert not to be taken by surprise.他们一直处于常备不懈状态以防突然袭击.Hearing this, I was instantly on the alert.我一听这话, 当下就警惕起来....
这家航空公司亏损达3,500万美元，而澳航出资帮助其摆脱了困境。The airline had losses of $35m and was bailed out by Qantas.两家航空公司将在票务和航班安排上展开合作。The two airlines will cooperate on ticketing and schedules.冬天的突然降临让铁路和航空运输系统陷入混乱。The sudden onset of winter...