1. Transcendentalism: A literary and philosophical movement, asserting the existence of an ideal spiritual reality that transcends the empirical and scientific and is knowable through intuition.
2. The Lost Generation: The term was first used by Gertrude Stein (1874-1946), one of the leaders of this group. It included the young English and American expatriates as well as men and women caught in the war and cut off from the old values and yet unable to come to terms with the new era when civilization had gone mad. It means this generation had lost the beautiful sense of the calm idyllic past.
3. Morality play: It is also called morality, an allegorical drama popular in Europe especially during the 15th and 16th centuries, in which the characters personify moral qualities (such as charity or vice) or abstractions (as death or youth) and in which moral lessons are taught.
4. Feminism: Feminism refers to movements aimed at establishing and defending equal political, economic and social rights and opportunities for women.
5. Imagism: A literary movement launched by British and American poets early in the 20th century in reaction against Victorian sentimentalism that advocated the use of free verse, common speech patterns and clear concrete images.
参考资料：《美国文学欣赏》