正文：

Civil wars are fought between citizens of the same country and are fought within the country.

內(nèi)戰(zhàn)是在同一國家的公民之間進行的，并且是在國內(nèi)進行的。

If citizens of a country disagree about a policy or leader, they may fight a civil war.

如果一個國家的公民對政策或領(lǐng)導(dǎo)人不滿意，他們可能會打一場內(nèi)戰(zhàn)。

A world war is fought when countries form alliances, and these alliances fight each other.

當國家結(jié)成聯(lián)盟時，就會發(fā)生世界大戰(zhàn)，而這些聯(lián)盟又相互爭斗。

A world war involves many or most of the world's most powerful countries.

世界大戰(zhàn)涉及許多或大多數(shù)世界上最強大的國家。

There were 2 world wars in the 20th century.

20世紀有兩次世界大戰(zhàn)。

Terrorism involves groups of individuals rather than countries.

恐怖主義涉及個人團體而不是國家。

Terrorists may come from different countries, and they may share the same beliefs.

恐怖分子可能來自不同的國家，他們可能擁有相同的信仰。

Terrorists often use car-bombings and suicide attacks on innocent people.

恐怖分子經(jīng)常對無辜的人使用汽車爆炸和自殺式襲擊。

A terrorist attack can happen at any time and any place.

恐怖襲擊可能隨時隨地發(fā)生。

An invasion occurs when one country attacks another.

當一個國家攻擊另一個國家時，就會發(fā)生入侵。

It sends its army into the other country, and attempts to take control.

它派軍隊進入另一個國家，并試圖控制。

One of the most famous invasions was when France invaded Russia in 1812.

最著名的入侵之一是 1812 年法國入侵俄羅斯。

A defensive war occurs when a country is attacked and needs to defend itself.

當一個國家受到攻擊并需要自衛(wèi)時，就會發(fā)生防御性戰(zhàn)爭。

Most countries have a military so that it can defend itself if it's attacked.

大多數(shù)國家都有軍隊，因此如果受到攻擊，它可以自衛(wèi)。

When France invaded Russia in 1812, the Russian army fought a defensive war and defeated the French army.

1812年法國入侵俄國時，俄國軍隊打了一場防御戰(zhàn)，打敗了法國軍隊。

題目：

Civil wars are often fought when one part of a country wants to become an independent country.

當一個國家的一部分想要成為一個獨立的國家時，經(jīng)常會發(fā)生內(nèi)戰(zhàn)。

Throughout history there have been many invasions.

歷史上有過多次入侵。

Sometimes two leaders will fight for power within a country and start a civil war.

有時，兩個領(lǐng)導(dǎo)人會在一個國家內(nèi)爭奪權(quán)力并引發(fā)內(nèi)戰(zhàn)。