Sometimes likened to UFOs, lenticular clouds are usually created by gravity waves.
透镜状云彩很像UFO，它通常由引力波造成。
The total mean square error for gravity survey in mountainous region estimated by the present methods are usually too small to be convincing.
山区重力测量工作中，用现有方法计算总均方误差，往往使均方误差偏小，异常的可信程度降低。
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