After Ziddu becomes its subsidiary, Longfin will provide financial services based on cryptocurrency through Ziddu. In 1934, professor rei, of the center for fluid mechanics, used model cars to measure the aerodynamic drag of various bodies in wind tunnels Under the conditions of open economy, the scale of international capital flows is huge, which greatly exceeds international trade volume, indicating the great development of financial globalization. The impact of interest-rate differentials on exchange rate movements is more important than in the past. When a country tightening credit, interest rates will rise, character formed in the international market interest rate difference, will cause the short-term funds internationally mobile, capital generally always is flowing from countries with low interest rates to countries with high interest rates.