It is important to note up-front that regular expressions, while very powerful, also have limitations.

必须指出的是前期的正则表达式，而非常强大的，也有局限性。

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While advances in replication and policies are very powerful features, the key to successfully implementing local mail replicas for users lies in the creation of a directory catalog.

虽然在复制和策略方面的改进是非常强大的功能，但成功实现用户本地邮件副本的关键在于创建目录编目。

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The human spirit can be very fragile, but incorporating positive thinking, such as "because I can," while, eliminating "because I can't" from your thought processes, can be very powerful.

人的精神可以是非常脆弱的，但是只要纳入积极的思考，就象“因为我能行”，就能够从你的思维过程中消除“因为我不行”的想法，从而使自己变得非常强大。

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