New Words：

purpose [ˈpɜːrpəs] n. 目的；用途；目标；意图
on purpose 故意地;特意地;有意地

Sample Sentences：

What was the purpose of her visit?
I'm almost sure she did it on purpose.
Do you think he made that mistake on purpose?
You are not sure if it was an accident or on purpose.

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