（用于介绍流行程度） ③_____ be used to do sth.（表示用途） ④_____ stand for / symbolize / signify_____.（某物象征了…
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正如前面提到的那样，原子控件和组合控件都不象其HTML对应物那样绑定至特定的表示，而是与特定的抽象用途相关。
As mentioned earlier, both atomic and compound controls are not bound to a particular presentation as their HTML counterparts are, but are instead associated with a particular abstract purpose.
但是，如果您的数据表示特定时间的用途，则需要显式设置这些值。
However, if your data represents usage at a particular time, you can set the values explicitly.
通过使用XForms，您在定义Web表单时可以顺利地将用途与表示分离。
With XForms, you can define Web forms in a way that successfully separates purpose from presentation.
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