但是您必须处理这样的情况：无法获取新添加的元素和属性的值。

But you need to handle the case that the values of newly added elements and attributes cannot be obtained.

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我们必须正确处理垃圾，这样我们才能更好再次利用它。

We must deal with the rubbish correctly so that we can reuse it better.

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这样的项目与顾客有规则的交流，并且必须处理需求的快速更改。

Such projects have regular interaction with the customer and must deal with rapid change to requirements.

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