be instrumental(in sth. – в чём-л.: These innovative techniques were instrumental in the structure of the new product. • He was instrumental in getting that contract. It got rolling under his leadership. • Konev is a problematic figure in Central Europe. Although he was instrumental in the defeat of Nazism, he also oversaw arrests and deportations of Soviet refugees in the immediate aftermath of the war. (washingtonpost.com)ART Vancouver)
play a vital role(в – in; также "play a vital part": "The erosion of any islands here would have released boulders that are likely to have contributed to the accumulation of the distinctive stone structures known locally as sarns." Dr Wood believes these sarns have played a vital part in perpetuating the story.bbc.comART Vancouver)
