求翻译：有形贸易是“无形贸易”的对称，指商品的进出口贸易。由于商品是可以看得见的有形实物，故商品的进出口被称为有形进出口，即有形贸易。有形贸易的进出口必须通过海关，海关对商品征收的关税是一国国际收支的最主要项目。是什么意思？

Visible trade is the "invisible trade" symmetry, merchandise import and export trade. As you can see the tangible goods are physical, it is called the visible imports and exports of goods import and export, that the visible trade. On visible trade, the import and export through the customs, the cust

Visible trade is "invisible trade goods" means the symmetry that the import export trade. Since the commodity has been visible in the import and export commodities, it is visible in kind is known as tangible import and export, namely, physical trade. Visible trade import and export of goods through

The visible trade is “the invisible trade” the symmetry, refers to the commodity the import-export trade.Because the commodity is the visible material object which may be able to see, therefore the commodity import and export is called the visible import and export, namely visible trade.The visible

Visible trade is "invisible trade" symmetry, means the import and export commodity trade. The tangible physical commodity can be seen, so the import and export commodities are called physical import and export, that is, the visible trade. Visible trade imports and exports must go through customs, th

The visible trade is the symmetry of " invisible trade ", the foreign trade to point goods. It is tangible real forms that can seen because of the goods, so the imports and exports of the goods are known as the tangible imports and exports, namely visible trade. The imports and exports of visible tr