They’re doing some very innovative work in solar energy.“innovative” here means something out of date.

If you have any questions, please feel free to interrupt at any time. This sentence means if you have something that you don’t understand, you can make a break in at any time. 点击查看答案&解析

Mr. Smith isn't available.This sentence means Mr. Smith is free and not busy. 点击查看答案&解析