中文：

投资国是指将资金投入企业或某个项目，以期望获得未来收益的国家。投资国通常拥有大量的外汇储备和储蓄，并寻求将这些资金用于投资以获得经济回报。

投资国通过向企业或项目提供资金来参与其发展，并从中获得经济收益。这些收益可能包括股息、利息、卖出投资的收益等。投资国可以通过直接投资或间接投资的方式进行投资，直接投资是指投资者直接拥有企业或项目的股份，而间接投资则是投资者购买企业或项目的债券或其他金融工具，从而获得利息或其他收益。

投资国的作用在于促进经济增长、创造就业机会和技术创新。通过将资金投入具有潜力的企业或项目，可以促进其快速发展并带来经济效益。同时，投资国还可以帮助提高国家的经济实力和国际竞争力，促进国家经济的发展和繁荣。

英文：

The investing country refers to the country that invests in enterprises or projects with the expectation of obtaining future economic benefits. The investing country usually has a large amount of foreign exchange reserves and savings, and seeks to use these funds for investment to obtain economic returns.

The investing country participates in the development of enterprises or projects by providing funds and obtains economic benefits from it. These benefits may include dividends, interest, and proceeds from selling investments. The investing country can invest through direct investment or indirect investment. Direct investment refers to the investor directly owning the shares of an enterprise or project, while indirect investment refers to the investor purchasing bonds or other financial instruments of an enterprise or project to obtain interest or other benefits.

The role of the investing country is to promote economic growth, create employment opportunities, and technological innovation. By investing in potential enterprises or projects, the investing country can promote their rapid development and bring economic benefits. At the same time, the investing country can also help improve a country's economic strength and international competitiveness, promote the development and prosperity of the national economy.