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....
在联欢晚会上大家都非常愉快.Everybody enjoyed himself ever so at the evening party.在这次圣诞节联欢会上我们玩得很不愉快.We had a ghastly time at the Chritmas party.希德生病,没法和大家联欢, 玛丽留 在家中陪他玩.Sid was sick and had to miss the fun; Mary remained at home to ...