To improve maternal health, barriers that limit access to quality maternal health services must be identified and addressed at all levels of the health system.

为了改善孕产妇健康，必须在各级卫生系统查明并消除限制获得优质孕产妇保健服务的障碍。

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Stress can “disturb cognitive processes such as learning and memory, and consequently limit the quality of human life, ” writes Kim.

他在文中写道，精神压力会“干扰像学习和记忆这样的认知过程，从而会影响我们的生活质量。”

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These comorbidities confound the treatment strategies that might otherwise limit the severity of COPD and improve quality of life.

这些共病性削弱了可能抑制COPD严重性和提高生活质量的治疗策略。

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"There is no theoretical limit to the picture quality of LCD screens, " says Sharp's Imai.

FORBES: Adventures in the Third Dimension

If the Broadcast Flag cannot be used, program providers will have to weigh whether the risk of theft is too great over free, off-air broadcasting and could limit such high-quality programming to only cable, satellite and other more secure delivery systems.

FORBES: Magazine Article

But there is a limit to the ability to substitute quality for quantity, and the U.S. has exceeded that limit.

CENTERFORSECURITYPOLICY: Section IV: Building a Two-MRC Force for the 21st Century