Hi Peng ! I love your videos!! They are so inspiring, honest and warming. Very lovely, congratulations. I truly believe this type of system to be revolutionary in the solution to so many of societies problems. Your system is easily the most beautiful which I believe is as important as its functionality. Particularly at the early stages of AP in terms of it being a great visual 'tool' to inform the public of this new solution. Perhaps you could install solar to make it fully autonomous. Perhaps local schools can adopt this as part of their curriculum. I believe word needs to spread and we all need a replicate of this system at the local level of each community. Congrats again.