继去年年底推出面向企业的5G商用网络后，韩国三大电信运营商5日起正式开始为大众办理5G手机入网手续。请看本报周四的报道：

South Korea will become the first country to commercially launch fifth-generation (5G) services Friday as it rolls out the latest wireless technology with Samsung Electronics’ new 5G-enabled smartphone Galaxy S10.

With one of the world’s top smartphone penetration rates, South Korea is in a race with China, the United States and Japan to market 5G, hoping the technology will spur breakthrough in fields such as smart cities and autonomous cars, and drive up its economic growth that slowed to a six-year low in 2018.

报道中的roll out就是“推出、展开”的意思。例如：

After the trial the transport department will decide whether or not to roll out the machines across the country’s airports.

实验后运输部会决定是否在全国机场推行这种机器。