| 例句 |
A baby who is not gaining weight is probably not getting enough to eat.婴儿如果体重不增加，很可能是因为没有足够的东西吃。Without extra help, it's going to be very difficult to meet the Friday deadline.如果不增加人手来帮忙，很难如期在星期五之前完成工作。The airport faces a chicken-and-egg dilemma: Airlines won't add more flights unless there is more demand, and there won't be more demand until there are more flights.机场面临着鸡和蛋的难题：只有需求上升航空公司才会增加航班，但不增加航班，需求是不会上升的。I can eat what I want but I never put on weight.我能想吃什么就吃什么，但是体重从来不增加。 |