1. Lowering the exchange rate of the US dollar: The interest rate cut by the Federal Reserve will lead to the decline of the exchange rate of the US dollar, because the interest rate cut will lower the yield of the US dollar, making investors more inclined to invest in other currencies or assets, thus pushing down the exchange rate of the US dollar and making the price of crude oil denominated in the US dollar rise relatively, because investors need to buy less US dollars.

2. Stimulate economic growth: Fed's interest rate cut can reduce the borrowing costs of enterprises and individuals, thus stimulating consumption and investment and promoting economic growth. Economic growth will bring higher energy demand, thus pushing up the price of crude oil.