Civil wars are fought between citizens of the same country and are fought within the country.
内战是同一国家的公民之间发生的战争，在这个国家内部发生的战争。
If citizens of a country disagree about a policy or leader, they may fight a civil war.
如果一个国家的公民对一项政策或领导人意见不一致，他们可能会打一场内战。
A world war is fought when countries form alliances and these alliances fight each other.
当国家结成联盟，这些联盟互相争斗时，就发生了世界大战。
world war involves many or most of the world's most powerful countries.
世界大战涉及许多或大多数世界上最强大的国家。
There were two world wars in the 20th century.
20世纪有两次世界大战。
Terrorism involves groups of individuals rather than countries.
恐怖主义是由个人组成的团体，而不是国家。
Terrorists may come from different countries and they may share the same beliefs.
恐怖分子可能来自不同的国家，他们可能有相同的信仰。
Terrorists often use car-bombings and suicide attacks on innocent people.
恐怖分子经常使用汽车炸弹和自杀式袭击无辜民众
A terrorist attack can happen at any time and any place.
恐怖袭击可能在任何时间、任何地点发生。
An invasion occurs when one country attacks another.
当一个国家攻击另一个国家时，就称为侵略。
It sends its army into the other country and attempts to take control.
它派遣军队进入另一个国家并试图控制它。
One of the most famous invasions was when France invaded Russia in
1812.
其中最著名的一次入侵是1812年法国入侵俄罗斯
A defensive war occurs when a country is attacked and needs to defend itself.
当一个国家受到攻击，需要自卫时，就会发生防御性战争。
Most countries have a military so that it can defend itself if it's attacked.
大多数国家都有军队，这样在受到攻击时就可以自卫。
When France invaded Russia in 1812, the Russian army fought a defensive war and defeated the French army.
1812年法国入侵俄国，俄国军队打了一场防御战，打败了法国军队。
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