He became the champion of the mixed martial arts competition.

He is the champion of the stone, paper, scissors game.

The single transferable vote is an important means to ensure the fairness of elections.

Demography is an important tool for understanding various aspects of society.

His efforts were like a mantis trying to stop a chariot, he couldn't achieve any results.

Dou is a popular dancer.

He trampled on my heart.

His heart seems to have frozen.

Please go straight down this road.

His answer was unexpected.