不能得出结论的（形容词）

(adjective) Not resulting in complete or definite proof; leading to no final result.

EXAMPLE: The doctors tried to find the cause of the mysterious illness, but all their laboratory tests were inconclusive.

医生们试图找出这种怪病的原因，但他们实验室的所有检测都无法得出结论。

讨论实质问题（成语）

(IDIOM) To address the basic and most important details of a problem, disagreement, or complicated problem.

EXAMPLE: The owners of the two rival companies knew they needed to resolve their dispute, so they had a meeting, and when they got down to brass tacks they found a solution to their problem.

这两家竞争企业的老板知道，他们需要解决争端。因此，他们开了一次会，讨论了实质问题，并找到了问题的解决办法。