The work must be completed within a certain time limit.

这项工作必须在一定期限内完成。

《牛津词典》

Where the consignee of import goods fails to declare with the Customs within the time limit mentioned above, a fee for delayed declaration shall be charged by the Customs.

进口货物的收货人超过前款规定期限未向海关申报的，由海关征收滞报金。

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In this era of Twitter.com and cell-phone text messaging, the many long URLs that don't fit within the 140-character limit placed on messages can be a hassle.

在这个 Twitter.com 和手机消息通讯时代，许多长 URL 不能满足消息上设置的 140 个字符的限制，这是一件麻烦事！

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The steeplechase follows, a 3, 105m course featuring three brush fences that have to be jumped three times and, once again, it must be completed within a time limit.

BBC: SPORT | TV/Radio Listings | Grandstand | Three-day eventing explained

If a trader does not book an OTC trade at the appropriate time, red flags should rise as all trades need to be confirmed within a specified time limit from the execution.

FORBES: Rouge Trading...Blinded By Profits

That figure would fall to 65% within a year, and in the years after that the limit would be 50%.

WSJ: Indian IT Workers in Cross Hairs of U.S. Bill