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.
如果你不管实在教室外还是在教室内都不愿意融入数学学习的进程，你将会在数学上有大麻烦咯。
If you aren't willing to be actively involved in the process of learning mathematics, both inside and outside of the class room, then you will have trouble passing any math class.
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