伪事实查询主题的第二个作用是创建维度的笛卡尔积，它能缩短时间。
The net result of the fake fact query subject will be to create a Cartesian Product for the dimensions, which returns in a shorter period of time.
研究表明，多普勒效应对伪距观测值的影响与伪距和伪距变化率的积成正比。
The study indicates that the influence of Doppler effect on pseudo range observations is proportional to the product of pseudo range and the rate of pseudo range variation.
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