Regarding groundbased observation , the largest optical telescopes to date are the twin 10 - m keck telescopes on mauna kea of hawaii.
位于夏威夷蒙那基亚山上的却克望远镜，口径达10米，是目前世上最大的光学望远镜。
The groundwater observation well-network for earthquake prediction in China is the largest precursory observation system except the seismograph array.
中国地震地下水动态观测网是我国仅次于测震网的第二大地震前兆观测系统。
The groundwater observation well-network for earthquake prediction in China is the largest precursory observation system except the seismograph array.
中国地震地下水动态观测网是我国仅次于测震网的第二大地震前兆观测系统。
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