英語達人請進來幫忙翻譯一句話，非常感謝，中翻英

The questions that were not solved in the last conference will not be solved in this one either; therefore, I don't think there is a need to start a new conference.

The questions that were not solved in the last conference will not be solved in this one either; so, I don't think it is necessary to hold a meeting again.

The issues that hadn' t been solved during last meeting would not be solved during this meeting, so I don't think it's necessary to have another meeting.