预选辐照整个闭环反馈的维护贯穿于一个指定曝光间隔时间。
The maintenance by closed loop feedback of a preselected irradiance throughout a designated exposure interval.
他们搜寻的时候，是先对同一片天空拍摄4张照片，每次曝光间隔10分钟，然后在计算机屏幕上比较它们的差异。
They start by taking four pictures of the same patch of sky, with ten minutes between each exposure, and compare them on a computer screen.
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