At current yields, the Treasury can borrow money for two years at an annual rate of about 4%.

按照目前的收益率，财政部可以以大约 4% 的年利率借入两年的资金。

And not only that, but scientists are unsure if farmers could even maintain their current crop yields due to changes in the environment.

不仅如此，科学家们还不确定农民是否能够因环境变化而保持目前的作物产量。

Let us recur to what happens at the crisis. So long as the boom was continuing, much of the new investment showed a not unsatisfactory current yield.

让我们回顾一下危机中发生的事情。只要繁荣还在继续，许多新投资的当前收益率就不会令人满意。

The disillusion comes because doubts suddenly arise concerning the reliability of the prospective yield, perhaps because the current yield shows signs of falling off, as the stock of newly produced durable goods steadily increases.

幻想破灭是因为对预期收益率的可靠性突然产生了怀疑，也许是因为随着新生产的耐用品库存稳步增加，目前的收益率显示出下降的迹象。