The course of exchange is, perhaps, almost equally so.

交换的过程也许几乎同样如此。

There are two criterions, however, which have frequently been appealed to upon such occasions, the custom-house books and the course of exchange.

然而，在这种情况下， 有两个经常被诉诸的标准， 即海关帐簿和交换过程。