They allow the client to validate the token, or request that the valid time span for the token be extended or ended.

它们允许此客户机验证此令牌或者请求延长或终止此令牌的有效时间区间。

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For example, you can use this to get a ready regexp for any valid hour in military time, as shown in Listing 15.

例如，你可以使用此工具来获取用于军事时间中任意有效时间的现成regexp，如清单15中所示。

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The validity period is indispensable to a firm offer, that remains valid until a stipulated time or until it is accepted or rejected.

有效期对于确盘是必不可少的，在规定的时间之前或在被对方接受或拒绝之前确盘一直是有效的。

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They've set free the coolest technology from behind the locked lab doors at IBM, Xerox and the telephone companies and aft of the machine-gun-equipped guards at America's defense contractors, all of whom had reasons of their own--perfectly valid at the time--to keep the cool stuff from seeing the light of day.

FORBES: Digital Rules

Employers have valid reasons for using part-time staff.

ECONOMIST: The Teamsters and UPS

In a press release and a five-page letter to the scientific community, Peter Kim asserts that although Merck had to correct a statistical method, the 18-month conclusion is still valid based upon the data Merck had at the time.

FORBES: Magazine Article