translation.en: The top left one is a very nice home-cleaning robot from a company called Dyson, in the U.K. Except it was so expensive -- 3,500 dollars -- they didn't release it.
translation.zh: 左上角是一个非常好的家用清洁机器人， 它是一家叫“Dyson”的英国公司生产的。不过它相当贵—— 3500美元——而且并没有上市。