What Happened To Mexico's Earthquake Warning System?
Mexico has an earthquake early warning system that gives people time to take cover. But that system didn't work when a 7.1 magnitude quake struck Mexico City, killing hundreds of people.
Đọc tiếp trên NPR
January 7, 2018 at 08:06PM
Environment
Chủ Nhật, 7 tháng 1, 2018
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