She and her husband already limit their children to one extracurricular activity at a time to keep them from exhaustion.

她和她的丈夫已经开始限制孩子一次只能参加一项课外活动，以免他们精疲力尽。

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For each morning activity he completed within his self-allotted time limit, he rewarded himself by putting money into his Hawaii-getaway fund.

对每个早晨的行动他都会在自己分配好的时间内完成，并把钱存入夏威夷度假基金里来奖励自己。

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This limit may change over time as it is dependent on your previous overall performance and transaction activity.

此限制可能随着时间而改变，因为它依赖于您以前的整体性能和交易活动。

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In addition, parents can actively monitor their child's online activity, limit play time duration and provide a virtual allowance for purchasing apps via MEEP!

ENGADGET: Oregon Scientific MEEP! tablet ships for $150, gives kids a safe, exclamation-filled place to play

Evans and Jamison emphasized that the program would create real-time network monitoring of malicious activity, limit the number of access points to government networks and standardize government security across all federal systems.

FORBES: Congress Grills White House Cybercrats