马克•藏伯格：地震仪的基本模型是一个箱体，箱内装置弹簧，弹簧上悬挂重物，地震来临时，重物在竖直方向上振动。
Mark Zumberge: Basically a seismometer is a box with a spring with a mass hanging inside, and as the ground shakes the mass goes up and down.
日本有世界上最先进的地震预警系统，有超过1000多个地震仪覆盖分布全国。
Japan has the world's most advanced earthquake early-warning system, with more than 1,000 seismographs scattered over the country.
日本有世界上最先进的地震预警系统，有超过1000多个地震仪覆盖分布全国。
Japan has the world's most advanced earthquake early-warning system, with more than 1, 000 seismographs scattered over the country.
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