例如，数学老师或者数学系有2个代数课程和两个几何课程。

For example, a math teacher or department has 2 algebra and 2 geometry courses.

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我认为几何是一门难学的课程。

I feel that geometry is a difficult subject.

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我认为几何是一门难学的课程。

I feel that geometry is a difficult subject.

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