如果你试图去查看或者修改该版本不适用的属性时，会出现异常。

An exception is thrown if you attempt to view or modify a property that is not valid for the version.

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但是，如果分类法试图捕捉所有可能出现的问题，它们就会太笨拙，不适合呼叫中心职员等一线人员使用。

However, if the taxonomies try to capture all possible problems, they become too unwieldy to use for front-line personal like call center employees.

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