并综合考虑人眼的目标发现能力、目标的亮度对比度、观察等级和探测概率的要求，计算出面源目标的作用距离。
The operating range for extended target is calculated by considering of the target finding ability of eyes, contrast of target luminance, discrimination level and detection probability.
儿童自控力在人的生命第一阶段主要是通过其3岁和5岁时失控行为的观察测评等级来衡量的；
Children's self-control during their first decade of life was measured using observational ratings of children's lack of control at ages 3 and 5;
有了PET扫描与MRI(核磁共振成像)，我们可以观察到大脑活动的波动，通过测量血液流动与营养物等级的变化。
With PET scans and functional MRI, we can observe fluctuations in brain activity by measuring changes in blood flow and levels of nutrients.
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