发送一个DNS请求很像在号码簿上查找一个电话号码：浏览器提供域名，要获得一个IP地址。
Making a DNS request is a lot like looking up a phone number in a phone book: the browser gives the domain name and expects to receive an IP address back.
建立一个通讯录，存放有姓名、电话号码、住址等，具备输入、查找、添加、修改及删除等功能。
A book, kept the name, phone number, address, etc., with the input, find, add, modify and delete functions.
应用推荐