(4209期)写信投诉比写邮件投诉靠谱吗 Is it better to complain by letter than by email

Be fine with=Like= Love 喜欢 我认为 I believe I suppose I think I believe In my mind 方便的 Convenient / user-friendly By the way 顺便说一下 A piece of paper 一张纸 Efficient and effective 效率效果的 See I told you 和你说过啦