因为未来的事情是不确定的，估值总是在一定程度上不够精确。
Valuation will always carry a degree of imprecision because anything in the future is uncertain.
即远期利率等于未来即期利率的期望值。
他们对未来生活期望值的降低将不可避免，这是一个棘手的问题，希腊正在经历这样一个过程。
Their expectations will have to be managed downwards: a tricky process, as Greece is demonstrating.
用于指定未来值或最后一次还款之后期望的现金余额。
Specifying future value or cash balance you want after you've made the final payment.
用于指定未来值或最后一次还款之后期望的现金余额。
Specifying future value or cash balance you want after you've made the final payment.
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