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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The Earth does not have an inexhaustible supply of resources, so every effort should be made to conserve resources and limit the impact of human activity on the planet.

地球上的资源并不是取之不尽、用之不竭的，所以我们应该尽全力保存资源，限制人类活动对地球的冲击。

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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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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

My guess is that the most profitable (and prolific) class action firms regularly engage in activity that may limit their potential growth and preclude mergers with other firms.

FORBES: Are Class Action Law Firms Too Corrupt to Go Global?