Don&;t ask sales stupidly: you can look at some advertisements in his sales office and * that focus on hardcover. Secondly, whether it is environmental protection material decoration or not, as an N-year advertiser engaged in home improvement, if he doesn&;t mention anything, he should know it. It is suggested that he should be ventilated for more than half a year after getting the hardcover room. If it is environmental protection material, he will definitely publicize the cost of hardcover and how to protect the environment. Taking this as a selling point is also a show-off capital, my experience