Every30secondsthereisanearthquake.Butdon'tworrybecausem...
問題詳情：Every30secondsthereisanearthquake.Butdon'tworrybecausemostaresoweakthattheycannotbefelt.Onlyafewbigoneshurtpeople.ManyearthquakeshappenedinChina,suchasthebigoneinSichuanin2008.Thousandsofpeop...