be sure of oneself的用法和樣例：
例句
- He's not so sure of himself these days.
他近來不大有自信。 - The teacher lacked assurance in front of his class.
那位教師在學生面前缺乏自信。
以上的知識獨代撰寫，受著作權護理，侵犯商標權必究
- 近期熱搜詞
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