Today, rivers are controlled for many reasons, primarily to maintain reliable water supplies for daily, agricultural and industrial needs, for power generation, for navigation, and to prevent flooding.

今天，河流控制的原因有很多，主要是为了维持可靠的水资源供应，以满足日常生活、农业和工业、发电、航行的用水需要，并起到防洪作用。

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The CVRJ program is helping the Department of Defense meet urgent system requirements and increased production demands to prevent the detonation of radio-controlled IEDs, says a representative.

一位代表说，CVRJ的计划在满足紧迫的系统需求和阻止无线电控制的IED的爆炸的需求上帮了国防部的忙。

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The organization shall ensure process outputs, products and services that do not conform to requirements are identified and controlled to prevent their unintended use or delivery.

组织应确保对不符合要求的过程输出、产品和服务得到识别和控制，以防止它们的非预期使用或交付。

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Using temporary barriers, berms and other obstacles, entrance to markets and specific communities is controlled through checkpoints, which allow citizens to come and go but which prevent would-be attackers.

CENTERFORSECURITYPOLICY: In defense of Baghdad��s ��walls��

Kevorkian was originally charged with murder, assisted suicide, and delivery of a controlled substance, but prosecutors dropped the assisted suicide charge to prevent the defense from presenting evidence about Youk's pain and suffering.

CNN: Kevorkian Case: Video of killing shown to jury