使用所有这些功能和相对较低成本，未来比较3会比较、同步和文件和目录也超出普通级别的合并。

With all these features and a relatively low cost, beyond Compare 3 takes comparison, synchronization and merging of files and directories well beyond ordinary levels.

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第三，一个国家能够比别的国家以较低成本销售某些产品，而且还从对有关产品具有比较优势的国家购买所需产品。

Third, one nation can sell some items at a lower cost than other countries and will also buy what it needs from those countries that have comparative advantage in the desired items.

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