翻译：不能想象人的一生总是一帆风顺的，我们能做的就是保最好的希望，做最坏的打算。(smooth)

We cannot always hope that our lives are going to be perfect and smooth, however, we can always keep our hopes high and prepare for the worst fall.

There will always be ups and downs in a person's life, all we can do is not expect too much from life, but that does not mean we should despair.