一方面是因为没有全面采取浮动汇率。

In part, that was because the move to floating rates was not complete.

但是，浮动汇率体系并不是免费的午餐。

But a floating-rate system is not a free lunch either.

世界各国又恢复浮动汇率就不足为奇了。各国中央银行也就无须维持本币的汇价了。

It is not surprising, then, that the world saw a return to a floating exchange rate system. Central Banks were no longer required to support their own currencies.