在专题报告会之前,大厅的地板已经被打扫过了。
They were the symbol of the symposium. Before the symposium, the floor of the hall had been swept.
在专题报告会之前,大厅的地板已经被打扫过了。
大厅的墙上有两把剑,它们对称的放着,它们是专题报告会的标志。
They were put in symmetry. They were the symbol of the symposium.
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