There are times when the difficulties appear too great and we just ________ , but when we do that, far from disappearing, the difficulties actually seem to grow.
句意： 有时候困难看起来太大了， 我们就认输了， 但当我们这样做的时候， 困难非但没有消失， 反而似乎在增加。
throw in the towel认输。blow the whistle告发； 揭发。 kick the bucket死了； 一命呜呼。 sit on the fence保持中立； 采取骑墙态度。