The cordless, hand-held tools we use in our homes, such as vacuum cleaners, flashlights, drills and saws came from the technology of these early space programs.
2017年12月四级真题（第二套）听力 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
(电话或电气设备)无电源线的，无塞绳的
A cordless telephone or piece of electric equipment is operated by a battery fitted inside it and is not connected to the electricity mains.