将它们与反回射束作对比而获得真实的地面速度。
The frequencies of the returned beams are compared with them to obtain the true ground speed.
不要等到日头，光明，月亮，星宿，变为黑暗，雨后云彩反回
While the sun, or the light, or the moon, or the stars, be not darkened, nor the clouds return after the rain
从所有反回的处方中获得使用PPI和其他药物的完整资料。
PPI and other drug exposures were obtained from a complete database of all reimbursed prescriptions in the county.
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