The sound is an emergency earthquake warning from an iPhone app that lets subscribers know when the quake will come, where the epicenterwill be located and how strong the shaking will be.
这一响声是iPhone的一款应用程序发出的紧急地震警报，让用户知道地震何时会来临，震中在哪个位置，以及地震强度有多大。
The sound is an emergency earthquake warning from an iPhone app that lets subscribers know when the quake will come, where the epicenterwill be located and how strong the shaking will be.
这一响声是iPhone的一款应用程序发出的紧急地震警报，让用户知道地震何时会来临，震中在哪个位置，以及地震强度有多大。
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