You can exchange opinions with them about the way of life in Japan and your country.

exchange 的意思是"交换、交流"，指双方互相给予或接收某物。 opinions 是 opinion 的复数形式，opinion 是名词，意思是"意见、看法"。 exchange opinions 指"交换意见、交流看法"，即双方互相分享各自的观点。