New words：

subject [ˈsʌbˌdʒekt] n.学科；主题；问题；话题；科目；主语；主体

Sample Sentences：

A subject usually comes before the verb in an English sentence.
We have seven subjects this term, including history and physics.
The artist chose a beautiful landscape as the subject of his painting.
The subject of our discussion today is about environmental protection.

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