Henry appeared to be very sure of himself, but his mother soon put him out of countenance with a few words of warning. 亨利显出一副自信心十足的样子,然而母亲稍加警告他很快就感到窘迫难堪。
He is sure of himself. 他非常自信。
I wish I had Graham's confidence, he's always so sure of himself. 我希望我能像格雷厄姆那样自信,他总是那么有自信心。