求翻译：孤立主义是美国二战前长期坚定不移的外交政策;政治(外交)、军事上避免对外部事务的介入应是孤立主义外交的基本内容.是什么意思？

American isolationism before World War II long-term firm foreign policy; political (diplomatic) and military intervention to prevent the external affairs should be the basic contents of the diplomatic isolationism.

Isolationism is a long-term commitment of the United States before World War 2 foreign policy; political, diplomatic, military, to avoid external affairs should intervene in the foreign policy of isolationism is basic content.

The isolated principle is in front of the American World War II the long-term steadfast foreign policy; Politics (diplomacy), in the military avoids to the external affair involvement being supposed to be isolates the principle diplomacy the basic content.

Isolationism is the United States before World War II, long-term foreign policy of the firm; political (diplomatic), avoiding external transactions on a military intervention should be the basic content of isolationism.

Isolationism is the United States before World War II, long-term foreign policy of the firm; political (diplomatic), avoiding external transactions on a military intervention should be the basic content of isolationism.