1 There are two types of glial cells in the nervous system: the large-bodied macroglia and the smaller microglia. 2  There are two classes of macroglia in the central nervous system: astrocytes and oligodendrocytes.
Exports directly contribute and imports directly reduce their nation's balance of trade (i.e. net exports). A trade surplus is positive net balance of trade, and a trade deficit is a negative net balance of trade.
trade port definition, trade port meaning | English dictionary. trade. 1 international trade that is free of such government interference as import quotas, export subsidies, protective tariffs, etc. pl n (Economics) (Brit) the ratio of export prices to import prices.