we must save the trees and not buy things made of ivory意思

we must save the trees and not buy things made of ivory意思 句型：We must save the trees and not buy things made of ivory. we must save the trees and not buy things made of ivory not,we,must,made,save,of,trees,and,things,buy,ivory save ,the,we,trees ,must,ivory,made of,things We shouldn't buy things made of ivory.这里的made是什么用法? 英语翻译We have chopsticks made of bamboo and ivory.意思是不是“我们有竹子做 Never buy anything made of ivory. We can save money by ____expensive things A.buy not B.not bu we must buy things we ( )A.need not B.do not need C.have not we often buy many kinds of things in the shop we should use the things made of paper 这句话?