对某事的重复，不管多么愉快，难道不是一个破坏性的过程吗？
Is not the repetition of something, however pleasurable, a destructive process?
但是总体上，不管我们的个人史多么的不同，使我们感到生气的事都有三个共同点：不可预测性，不愉快和不确定性。
But in general, the things that annoy us tend to have three things in common, regardless of our personal histories: Unpredictability, unpleasantness, and uncertainty.
不管旅行社是多么细心周到，你仍需要注意一些问题，以确保旅行的安全和愉快。以下几点希望能给您以参考。
Yet despite how meticulous travel agents may be, there are always some things people need to look after themselves to ensure a pleasant and safe journey.
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