They must be discussing something important.
他们准是在讨论重要的事情。
They must have been discussing something important.
他们刚才准是在讨论什么重要的事。
They were discussing something important when I went in.
我进去时他们正在讨论一件重要的事情。
He was sitting on the floor in a half-circle discussing something.
他在一半中坐在地板上-讨论某事的圆周。
Don't break into their conversation, they are discussing something important.
不要打断他们的谈话，他们正在讨论重要的事情呢。
That is just not something that we are discussing at this time.
我们目前不讨论这种行动。
That is just not something that we are discussing at this time.
我们目前不讨论这种行动。
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