e sure of 确信
例句：She looked over her shoulder to be sure of her footing.她扭头看了看后面以确认自已是否站稳了.
be sure about 对.很有把握
例句：You can be sure about their interest in it.你可以肯定他们对引很感兴趣.
be sure of 与 be sure about 的区别,
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