Crucial is the key meaning. The decisive factor is the key factor and the key decision.

Former Tennessee Senator Thompson, a candidate for the 2008 US presidential election, took part in the public debate for the first time on Tuesday night. The New York Times said, "This is Thompson's crucial debut", which is Thompson's crucial debut.

At the same time, the three main candidates of the Democratic Party opened the battlefield in Iowa.

"This battle is seen as a partisan struggle between Mr. Obama and Mr. Edwards." The campaign in Iowa is particularly crucial for Obama and Edwards. Once you lose to Hillary, I'm afraid it's hard to recover the defeat.