For example, one person may have a fax number, while another may not.

例如，一个人可能有传真号码，而另一个人没有。

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You could also add information, like a phone number, a fax number, an E-mail address, or a Web site.

您还可以添加信息，比如电话号码、传真号、电子邮件地址或网址。

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So the person without a fax number does not need to define a fax value, whereas the person with a fax number is free to do so as they please.

因此，对于没有传真号码的人而言，就不需要定义传真的值，而对于有传真号码的人，则根据他们的意愿定义该值。

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We have smaller leaks all the time, you know, a fax number is wrong by a digit, and the number that is loaded into the system is not the pharmacy down the street, but some law firm.

WSJ: Boss Talk: Updating Doctors' Offices With the Help of Cloud Services

The evidently fake statements, which bear the number of a PaineWebber fax machine in the firm's San Francisco office, listed some of the gold stocks Lerma owned, but with false share prices.

FORBES: Ay, caramba!

"There have been instances where people have been asked to fax back spurious lengthy surveys to a personal number at rates of up to 37.5p per minute, " said Oftel in a statement.

BBC: Oftel issues scam warning