Coals carried, either by land or by inland navigation, pay no duty.

通过陆路或内陆航运运输的煤炭不缴纳关税。

The extent and easiness of this inland navigation was probably one of the principal causes of the early improvement of Egypt.

这种内河航运的范围和便利性可能是埃及早期改善的主要原因之一。

It is remarkable, that neither the ancient Egyptians, nor the Indians, nor the Chinese, encouraged foreign commerce, but seem all to have derived their great opulence from this inland navigation.

值得注意的是，无论是古埃及人、印度人还是中国人都不鼓励对外贸易，但似乎都从这种内陆航运中获得了巨大的财富。