随着各国经济交往的日益密切，国家间缔结的避免双重征税协定的数量也不断增加。

Following the increase in international trade and investments, more and more bilateral tax treaties are created to avoid international double taxation.

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因为有利于这两个国家间进行合作的几种因素都一直在起作用，他们之间才能够成功地达成科学技术合作协定。

The two countries could reach agreement successfully on scientific and technological cooperation because several factors favorable to their cooperation had been at work.

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