A:wow!Your smartphone is pretty cool.
B:Thanks.but do you have one?
A:No,my mother says that it will affect my study
B:come on.Every coin has two sides.You can't keep looking at the side effcet.
A:yeah,I know.We can get some useful information on the internet ,amd we can contact with our friends and family.It's so convenient .
B:yes,but don't forget the side effect.we may be addicted to the games,ebooks and pop-music,we will get lost finally.Because we want to do nothing but play our smartphone.
A:yes,I can't agree with you more.but if we can make ues of the advantage of the smartphone,we can be the master,not the slave.don't you think so?
B:yeah.