但其仍然在理论及实践上存在诸多困惑，出路是引入外国法中的中间判决制度以及确立诉之预备合并制度。
However , there are still quite some perplexity about that , theoretically or practically , the solution for which is to introduce the interim judgment system in foreign laws as well as to set up the preparatory joinder of actions system .
诉之预备合并