An intricate set of metal layers focuses and manipulates incoming radio waves, allowing the tag to send back a clearsignal.
这套装置以一系列精巧的金属片来聚焦和操控入射的无限电波，使标签将清晰的信号反射回来。
2
It means that you repeat back some words he is using, sending a clearsignal that you're listening carefully and that you think what he is saying is important.