教授走进教室时，我们正兴致勃勃地讨论中东的形势。
We were caught up in a discussion about the situation in the Middle East when the professor walked into the classroom.
教授走进教室时，我们正讨论中东的形势。
We are discussing Middle-East situation when the professor came into the classroom.
教授走进教室时，我们正讨论中东的形势。
We are discussing Middle-East situation when the professor came into the classroom.
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