求翻译：选择税是对于一种进口商品同时订有从价税和从量税两种税率，在征税时选择其税额较高的一种征税。但有时为了鼓励某种商品进口，也会选择其中税额低者征收。是什么意思？

Choose an import tax for goods at the same time there ad valorem tax and the amount of tax from the two rates, in the selection of its tax levy a higher tax. But sometimes in order to encourage imports of certain goods, which will choose the lower tax levy.

Choose a tax for an import commodity have both ad valorem duty tax and from Volume Two tax rates, tax equalization, to choose their taxes at a higher of a tax. But sometimes, in order to encourage a certain kind of commodity imports, it will also choose low taxes are levied on them.

The choice tax is simultaneously subscribes regarding one kind of article of importation has the ad valorem duty and the specific duty two kind of tax rates, when taxation chooses its tax amount high one kind of taxation.But sometimes in order to encourage some kind of commodity import, also can cho

Choose tax for imported goods at the same time there is ad valorem duties and specific duties of two tax rates, select the amount of higher taxes at tax time. But sometimes, in order to encourage some imports of goods, will choose low taxes levied.

The alternative duty concludes two kinds of tax rates of ad valorem duty and specific duty to a kind of import goods at the same time, choose a kind of relatively high taxation of the amount of tax to be paid of it while levying taxs. But sometimes in order to encourage a certain goods to be importe