in 1968,the american goverment worked with the phone company to establish 911 as thecentral number for all types of emergencies.翻译

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in 1968,the american goverment worked with the phone company to establish 911 as thecentral number for all types of emergencies.翻译
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in 1968,the american goverment worked with the phone company to establish 911 as thecentral number for all types of emergencies.翻译
in 1968,the american goverment worked with the phone company to establish 911 as the
central number for all types of emergencies.翻译

in 1968,the american goverment worked with the phone company to establish 911 as thecentral number for all types of emergencies.翻译
1968年,美国政府同手机公司合作,确定把911作为各种紧急求助的重要电话号码.