牆紙自己怎樣修保？

You must have some lift over wall paper so you first take it out & match the torn part to have the same pattern . Put the wall paper tightly over the broken part using a sharp knife to cut through it . Now you have a same size of wall paper to replace the torn old one . The next step is to scratch away the old spot . After you clear away the old paper you can adhere the new old on it .