The virtual form field option is the solution.

解决这个问题就需要用到虚拟表单域选项了。

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It abstracts a form of technology away from its original and real environment and delivers it in a virtual form to users.

它从原来的真实环境中抽象出资源的虚拟形式，以虚拟形式向用户提供资源。

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But last month Mr Grisham's publisher announced that the author had had a change of heart: henceforth all of his books will be available in virtual form.

但就在上个月，葛里逊的出版商表示这位作家的心意已变：从今以后，他的所有作品都会发售电子版本。

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That will come in the form of virtual goods which they are already doing and a new adsense like community ad model.

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But what if you could tag a real-life building with a photo of yourself or some other content, as a form of virtual graffiti?

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This, perhaps, is virtual manufacturing in its purest form.

ECONOMIST: Manufacturing technology