New words：

major [ˈmeɪdʒər]
adj.严重；主要的；重要的；大的
n.少校；专业课；主修课程
v.主修；专攻

Sample Sentences：

Mathematics is my major.
He's a major in the US army.
A major problem is the absence of water.
She majored in Maths and Physics at university.
They suffered some major setbacks during the fighting.

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