A country is an area of land that is controlled by its own government. It refers to territory. It's a political and geographical concept.

country（国家）是指由自己的政府控制的土地。它指的是领土。这是一个政治和地理的概念。

A nation mainly refers to a group of people united by common origin, history, culture or language, inhabiting a particular territory. It's a cultural as well as a political concept.

nation(国家；民族)主要指因共同的起源、历史、文化或语言而团结在一起的一群人，居住在一个特定的领土上。这既是一个文化概念，也是一个政治概念。

A country is one of the political units which the world is divided into, covering a particular area of land.

country（国家）是划分世界的政治单位之一，覆盖特定的土地面积。

Indonesia is the fifth most populous country in the world.

印度尼西亚是世界上人口第五大国。

...the boundary between the two countries.

…这两个国家的分界线。

The people who live in a particular country can be referred to as the country. 生活在一个特定country（国家）的人可以被称为country（国民）。

Finally the country got some much-needed good news.

最后该国人民得到了一些他们最需要的好消息。

A nation is an individual country considered together with its social and political structures.

一个nation（国家）是一个单独的国家，与它的社会和政治结构一起考虑。

Such policies would require unprecedented cooperation between nations.

这样的一些政策会要求国与国之间前所未有的合作。

The nation is sometimes used to refer to all the people who live in a particular country, or all the people who belong to a particular ethnic group.

nation（全国国民；民族）有时用来指生活在一个特定国家的所有人，或属于一个特定民族的所有人。

It was a story that touched the nation's heart.

这是一个感动了全民族的故事。

...the former chief of the Cherokee nation.

…前任切罗基族酋长。