supply rate

Depositors earn the supply rate, which is funded by interest paid by borrowers in the pool.存款人赚取存款利率，该利率由池中借款人支付的利息提供资金。

Supply rates are always lower than borrow rates; the difference funds the protocol's reserve factor.存款利率总是低于借款利率；其间的差额为协议的储备金率提供资金。