The spirit that he devotes himself into the scientific research has impressed us very much,but I'm not interested in his nonobjective theories.
The scientists have now had no conclusion to why this earthquake happened.
或者：The scientists have now had no conclusion to the possible reasons that caused this earthquake.
楼上注意第一句话中是“精神”给我们留下深刻印象,而不是“贡献”.