Reinforce v.加强，补充 -to make a structure or material stronger ,especially by adding another material to it @reinforcing ring补强圈（∈reinforcement pad) 注意： stiffen---(of part of the body to become,or to make sth become, difficult to bend or move @)stiffening ring加强圈Reinforce v. 加强，补充 -- to make a structure or material stronger ,especially by adding another material to it @ reinforcing ring 补强圈(=reinforcement pad) 注意： stiffen---(of part of the body ) to become , or to make sth become, difficult to bend or move @stiffening ring 加强圈