About smart speaker

(A) Do you have a smart speaker at home?
     
       No, I don't have it at home, but there is an Apple's Siri in my phone.

(B) What is a smart speaker?

      It is a smart device, like the Google Assistant, Amazon's Alexa or Apple's Siri. It could answer anything and do all sorts of questions.

(C) How does a smart speaker work?

       It is like a listening bug. It could actively listen to what's going on in your home when they hear the keyword. and the microphone is still on all the time to detect the keyword. If you give a voice command, it will do what you want.

My thoughts about Hyperloop system

Hyperloop system is the transportation of future which is been developing. In my opinion, I think this transportation is feasible. Why I think so is because Hyperloop is not only faster and cleaner but cheaper than highway. It is very difficult to meet these three conditions at the same time. These strengths will bring great benefits to people in terms of transportation and also prove the progress of  science and technology.