(digital subscriber line) a telephone line that has special equipment which allows it to receive information from the Internet, or send information at very high speeds 数字用户线路〔一种连接因特网的电话线〕
From Longman Business Dictionary
DSLDSL noun [countableC]
COMPUTINGTELECOMMUNICATIONS (digital subscriber line) a type of telephone line that provides people with a fast connection to the Internet, digital television, and telephone services