Field use proves the check valve can prevent effectively sand plugging and extend distinctly the pump checking period.

现场试验证明，电潜泵防堵单流阀能够防止砂堵单流阀，提高开机成功率，显著延长电潜泵检泵周期。

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To improve the quality of electric submersible pump (ESP) and extend the pump checking period of the ESP Wells, a multifunction automatic control and test system for ESP is developed.

为了提高电潜泵产品质量，延长电潜泵井的检泵周期，研制了电动潜油泵多功能自动控制测试系统。

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Stealth probes collect a wide-variety of data throughout the system, checking for any methodical attacks over a long period of time.

隐式探测通过系统收集各种不同的数据，检查任何一个有计划的有策略的攻击。

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"The SEC and state attorney generals are vigilant about checking company Web sites and local press during the waiting period and will derail an IPO if the company is found to be gun-jumping, " said Heather Badami, a securities attorney at Bryan Cave.

FORBES: Google's Quiet-Period Paranoia

Users can practice this with, for instance, leaving the house without checking the door lock multiple times, over a given time period.

CNN: Smartphone apps become 'surrogate therapists'

Toronto set a new mark for shot futility with only two in the second period as the Devils played their usual tight-checking style against a Maple Leafs lineup that wasn't able to match New Jersey's desperation.

WSJ: Reimer SO sends Devils to 10th straight loss