What's supposed to make us happier (pursuing our own evolution), can be the source of our misery when we're doing it for the wrong (ego-driven) reasons.
如若我们因为错误的理由(自我驱驶)做某件事，那么本应该使我们更高兴的(追求自我进化)很可能会成为我们痛苦的根源。
For all these reasons, schema evolution is a very important topic that has been researched in the context of relational, object-oriented, and XML databases.
由于上述这些原因，模式演化作为一项重要课题需要在关系、面向对象和XML数据库环境中加以研究。
In the point of the evolution theory, this exists for reasons.
从进化论来看，这种存在是合理的并且是必须的。
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