Steering exposure time of a camera through control electron shutter with laser echo pulse is an effective method for inhibiting background noise.
用激光回波脉冲控制电子快门来操纵摄像机的曝光时间，是抑制背景噪声的一种有效方法。
An effective industrial hygiene program must be able to prevent the harmful factors of employee contact immediate response, and long time after exposure in diseases.
一个有效的工业卫生计划必须能够防止员工接触即刻反应的有害因素，以及在接触之后的长时间内才引发的疾病。
During construction and after construction, effective measures should be taken to prevent rain washing and sun exposure, and protective layer should be made in time.
施工时及施工后，应采取有效措施防止雨水冲刷及烈日暴晒，并应及时做保护层。
During construction and after construction, effective measures should be taken to prevent rain washing and sun exposure, and protective layer should be made in time.
施工时及施工后，应采取有效措施防止雨水冲刷及烈日暴晒，并应及时做保护层。
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