当我第一次走进教室我头痛我不能理解教授说。
When I entered the classroom at first time I was headache as I couldn't understand what the professor was speaking.
当我第一次走进教室，我头痛，我不能理解教授说。
When I entered the CLASSroom at first time, I was headache as I couldn't understand what the professor was speaking.
我甚至没有意识到，我是在开始上课后才走进教室的，这是我第一次在英语课上迟到。
I didn't even realize when I first walked in that class had already started.
我甚至没有意识到，我是在开始上课后才走进教室的，这是我第一次在英语课上迟到。
I didn't even realize when I first walked in that class had already started.
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