Kluczowa rola. niezbędny, istotny, ważny, decydujący-very important. The crucial changes must come from within the country itself. This is a crucial moment to make this decision.
zażenowany, zakłopotany. I was really embarrassed the first time I tried to kiss a girl. embarrass sb. wprawić kogoś w zakłopotanie, zawstydzić kogoś."I know I've embarrassed you, sir," she said.