They seemed to be discussing something important.
他们似乎在讨论重要的事情。
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。
As is so often the case in my family, the original subject leads to another and another, until we are discussing something quite different.
正如我家常常出现的情况，最初的话题会引出其它一个又一个新问题，直到我们谈论的内容与最初的毫不沾边为止。
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。
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。
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。
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