2. Common foreign exchange currency pairs: Euro against US dollar, Pound against US dollar, US dollar against Japanese yen, Australian dollar against US dollar, etc.
3. High-interest currency: High-interest currency refers to the currency with high interest rate in this country. For example, the Australian dollar and the New Zealand dollar are typical high-interest currencies, so the currency pairs related to the Australian dollar and the New Zealand dollar are high-interest currency pairs, such as the Australian dollar against the US dollar, the euro against the Australian dollar and the New Zealand dollar against the US dollar.