当下的利率有时候被用来作为一个简单（却不正确）的折现率的约数。
The current interest rate is sometimes used as a simple (but incorrect) proxy for discount rate.
利率是用于对于未来现金流折现的。
Interest rates are used to discount those cash flows and calculate their present value.
否则，应当采用租赁合同规定的利率作为折现率。
Otherwise, it shall adopt the interest rate provided in the lease agreement as the discount rate.
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