Participants attend a session of the 21st Euro Finance Week in Frankfurt, Germany, on Nov. 14, 2018. A senior member of German central bank (Bundesbank) Burkhard Balz on Wednesday called for perseverance and patience for the international usage of the Chinese currency renminbi (RMB) at the 5th European-Chinese Banking Day session amid 21st Euro Finance Week Frankfurt. (Xinhua/Lu Yang)