tā / zài / bǐ / sài / zhōng / kàn / zhǔn / jī / huì / ， / yī / jǔ / ná / xià / le / guàn / jūn / 。

他在比赛中看准机会，一举拿下了冠军。

He watched for his chance during the competition and won the championship in one go.