Previous to the conference we had discussed the matter.
在会议召开之前，我们讨论了这个问题。
Previous to the conference we had discussed the matter among ourselves.
在会议之前，我们讨论了这个问题。
They had to summon a second conference and change the previous decision.
他们不得不召集第二次会议，改变以前的决定。
They had to summon a second conference and change the previous decision.
他们不得不召集第二次会议，改变以前的决定。
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