A: The case was historic.

　　B: Why, did it set a precedent ?

　　precedent

　　n.1.先例，范例，判例

　　2.惯例

　　A: Did Mr. Smith win the election?

　　B: No, he precipitated his downfall long ago.

　　precipitate

　　vt.1.(突如其来地)使发生，促成

　　2.使沉淀，使沉析

　　n.沉淀物

　　a.突如其来的

　　A: Did the case reach a conclusion?

　　B: No, the lack of firm evidence precluded a final decision.

　　preclude

　　vt.阻止，排除，妨碍

　　A: Did you meet your predecessors before entering this company?

　　B: No, they left before I arrived.

　　predecessor

　　n.1.前任，前辈

　　2.(被取代的)原有事物，前身

　　A: You rarely agree with the majority.

　　B: Just because ideas are predominant , it does not make them right.

　　predominant

　　a.1.占主导地位的，显著的

　　2.(在数量等方面)占优势的，占绝大多数的

　　A: What is the prefix to your local telephone number?

　　B: I m not sure, you better check the phone book.

　　prefix

　　n.1.前缀

　　2.(人名前的)称谓

　　vi.1.加 作为前缀

　　2.把 置于前面

　　A: The case was historic.

　　B: Why, did it set a precedent ?

　　precedent

　　n.1.先例，范例，判例

　　2.惯例

　　A: Did Mr. Smith win the election?

　　B: No, he precipitated his downfall long ago.

　　precipitate

　　vt.1.(突如其来地)使发生，促成

　　2.使沉淀，使沉析

　　n.沉淀物

　　a.突如其来的

　　A: Did the case reach a conclusion?

　　B: No, the lack of firm evidence precluded a final decision.

　　preclude

　　vt.阻止，排除，妨碍

　　A: Did you meet your predecessors before entering this company?

　　B: No, they left before I arrived.

　　predecessor

　　n.1.前任，前辈

　　2.(被取代的)原有事物，前身

　　A: You rarely agree with the majority.

　　B: Just because ideas are predominant , it does not make them right.

　　predominant

　　a.1.占主导地位的，显著的

　　2.(在数量等方面)占优势的，占绝大多数的

　　A: What is the prefix to your local telephone number?

　　B: I m not sure, you better check the phone book.

　　prefix

　　n.1.前缀

　　2.(人名前的)称谓

　　vi.1.加 作为前缀

　　2.把 置于前面