数学老师手里拿着一本书走进了教室。
The maths teacher walked into the classroom, with the book in hand.
他整晚都在教室里做一道数学题。
He had spent the entire night in the classroom working on a mathematics puzzle.
还有一次，中午，我吃完饭去教室做数学题。
On another occasion, at noon, I eat a meal to go to the classroom math.
当我到教室时，数学老师已经开始讲课了。
When I got to the classroom, the maths teacher had already begun his lesson.
数学老师走进了教室。
数学老师走进了教室。
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