求翻译：两个人对这次旅行做了充分的准备，风背上的包里装满了旅行必须品，可他们没有想到天气会如此变化。风想，这个世界真是变幻莫测的。也许人世间的诸多遗憾就是这样产生出来的吧！？?是什么意思？

Two people on the trip was well prepared, wind on the back of the bag is filled with travel necessity, but they did not expect the weather will change. Wind, the world is so unpredictable. Perhaps many of the world unfortunately is so out of it!??