a special telephone line that people can use in order to get information or to talk about sth 电话咨询服务专线；热线
a direct telephone line between the heads of government in different countries （各国政府首脑之间通话的）热线
a special telephone line that people can use in order to get information or to talk about sth 电话咨询服务专线；热线
a direct telephone line between the heads of government in different countries （各国政府首脑之间通话的）热线