复利在任何时期利率乘以变化的本金未支付的利息加到本金中从而成为新一期的本金
Compound interest involves multiplying the interest rate at any period by the changing principal and adding the unpaid interest to the principal, thereby becoming the principal for the new period
以上为机器翻译结果，长、整句建议使用 人工翻译 。