我被要求伸展手臂，收紧胸肌。I was required to hold out my arms and flex my pectorals.那位裁缝在衣服的腰部打褶收紧.The dressmaker gathered the cloth to the narrowest part of the waist.收紧肌肉,然后起跳.Gather up your muscles and jump....
We have contingency plans.我们有应急方案。We should be prepared for any contingency.我们应该对任何应急情况有所准备.We must always be prepared for every contingency.我们必须始终做应急准备....