New Words：

define [di'fain] v. 规定；定义；界定；明确；解释
definition [.defi'niʃən] n. 定义；阐释

Sample Sentences：

How do you define right and wrong?
Please listen while I define your duties.
The powers of the police must be clearly defined.

What's your definition of happiness?
What is Happiness in your definition?

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