Foreign exchange refers to a variety of payment vouchers expressed in foreign currencies for international settlement. It includes foreign currencies (bank notes, minted coins), foreign currency securities (government bonds, corporate bonds, stocks, etc. ), and foreign currency payment vouchers (bills) , Bank deposit vouchers, postal savings vouchers, etc. ) and other vouchers that can be cashed abroad. Which of the following are not foreign exchange? ['Water conservancy construction bonds issued by the British government.', 'Citibank deposit certificate.', 'The currency of the European Union country Netherlands 200 Euros.', "Cash deposit certificate of Taiwanese-funded company's 10 million US dollars converted into RMB."]