人生本就是一连串的困难；你刚解决了一桩，另一桩又会接踵而来。
Life is a series of problems. Every time you solve one, another is waiting to take its place.
困难会接踵而来，面对新目标，新压力，我们不得不一次比一次更艰难去完成任务，如此周而复始。
Difficulties will follow, in the face of new targets, new pressure every time we have to complete the task more difficult, so the cycle.
最后，维护如此困难的原因之一在于，当改变数据库设计时，其他的问题都会接踵而来。
Ultimately, one of the reasons that maintenance is so difficult revolves around the problem of changing the database design.
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