being the catalyst

居間

I find it hard to put into words what we feel for all the work the National Taiwan University Library has done on this documentary film. We also wish to thank Mr. Lin for being the catalyst that brought this all about.

我們實在找不到適切的言語來表達我們對於臺灣大學圖書館製作這一部歷史紀錄片的感激。我們也再一次謝謝林炳炎先生的居間，今天的這一切才有可能發生。

catalyst
noun [C]
1 SPECIALIZED something that makes a chemical reaction happen more quickly without itself being changed

2 an event or person that causes great change:
The high suicide rate acted as a catalyst for change in the prison system.

(from Cambridge Advanced Learner's Dictionary)

catalyst 或許"促成此一美事之大恩人"......