A:Hello,how are you these days?B:Oh,well,thank you,what about you?A:I am well,too.Well,I know the abacus was invented in China,your hometown,can you tell me something about that?B:OK.Abacus was invented in the sixth century by Mr Li,and it is a really useful tool for people,It was uesd for calculting in the older days,and now,there are also some people who use it.A:Oh,thank you very much.B:You are welcome.Well,I want to know something invented in your country,can you show me?A:Sure!The telescope was invented in 1609 by Galileo in Italy,it is really a amazing tool for all the science area.It is used to find the stars in the sky,which helps us konw more of the outer space .B:Oh,it is really a great tool,thank you very much.A:You are welcome.