I need to examine all possible contingencies.我需要审视一切可能出现的情况。We must consider all possible contingencies.我们必须考虑一切可能发生的事。We must be prepared for all contingencies.我们要作好各种准备,以防意外....
Why do you look so down in the mouth?你为什么显得这样消沉?Why are you so down in the mouth, anyway?不过,你为什么这么没精打采的?Paul looks down in the mouth because she failed in the attempt.保罗因为尝试失败看起来很沮丧....