The nature of these rules is such that they may change frequently and can be complex and dynamic.

这些规则的特性是：它们可能会频繁变化，可能比较复杂，也可能是动态的。

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The problem with this type of approach is that the users frequently don't really know what they want and either change their minds or think of something else along the way.

但是这种方法的问题在于，用户常常并不真正知道他们想要什么，经常改变想法，或者想到其他的东西。

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They think people who change their jobs frequently are feckless. They believe that the only way to success is to stick to one job, for constant practice in a professional field helps make an expert.

许多人喜欢一生中做一件工作，他们认为经常换工作的人软弱无能，他们相信成功的唯一途径就是坚持一项工作，因为在一个专业领域里不断的实践有助于专家的形成。

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Because of rapid technological change, they say, people must be prepared to change jobs frequently: therefore, pensions and health care should be portable.

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If we had several severe stock market shocks and Treasuries declined more frequently than they had historically, we might change our perspective as well.

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He had to change out his gloves frequently because they got so damaged.

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