题目内容
n. a painting, drawing or photograph of a person, especially of the head and shoulders
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n. a tall plant like grass with a hollow stem that grows in or near water
a. done without delay; vt. to make sb. decide to do sth. ; to cause sth.to happen
n. an introduction to a book, especially one that explains the author's aims
vt. to keep a particular quality, feature, etc. ;to make sure that sth. is kept
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