Henry appeared to be very sure of himself, but his mother soon put him out of countenance with a few words of warning. 亨利顯出一副自信心十足的樣子，然而母親稍加警告他很快就感到窘迫難堪。
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樣自信，他總是那麼有自信心。
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