照相观测比目视观测记录了更多的定量信息。
Photographic observations can record more quantitative information than visual observations.
这是通过观测比先前远得多的造父变星的可见光谱实现的，结果与地面望远镜观测结论类似。
This was accomplished by observing Cepheid variables at optical wavelengths out to greater distances than obtained previously and comparing those to similar measurements from ground-based telescopes.
过去几年的卫星观测和潜艇调查显示，极地地区的冰层减少了，但最近的测量显示，冰层的减少量比之前设想的更为明显。
Satellite observations and submarine surveys over the past few years had shown less ice in the polar region, but the recent measurements show the loss is more pronounced than previously thought.
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