She seems very sure of herself.
她好像十分自信。
《牛津词典》
She's always so sure of herself.
她总是这么自信。
youdao
She was not at all a snob: far too sure of herself.
她一点也不是个势利的人，她太相信自己了。
She had overcome extreme shyness and had become very sure of herself without ever losing her human touch.
CNN: Henry Kissinger
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