1. A random signal of known statistical properties of amplitude, distribution, and spectral density. 
   振幅、分布及谱密度等的已知统计特性的随机信号。
2. The expected value of a positive integral power of a random variable. The first moment is the mean of the distribution. 
   矩，动差任意变量的正整数功效的期望值。第一个矩是分配的平均数
3. Using the technology of the Geographic Information System, the new system is able to visualise the spatial and temporal distribution of red tides and provides quick analysis of their development and movement. 
   这套新系统采用地理信息系统技术，能有效地展现红潮的地域和时间分布，并可以快速分析红潮的发展和移动情况。
4. Unlimited in spatial extent. 
   无限延伸的，无穷的在空间范围上无限大的
5. erection of spatial grid roofstructure 
   网架屋盖架设

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