我经常和爸爸在家下棋,爸爸下得比我好,总是赢我,但我下决心,要赢他,有时我私下研究,想提高棋艺,昨天我终于赢了一次。 I often played chess with my father at home. He played better than me and always beat me. But I made up my mind to beat him. Sometimes I studied chess in secret in order to improve the skill in chess. Yesterday I beat him at last.