副词
中文翻译：确定无疑地
同义词：
['undoubtedly', 'certainly', 'beyond doubt']
例句：
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1.He is to a certainty the bestcandidate for the job.
他毫无疑问是这个职位的最佳人选。
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2. She was to a certainty right about the weather forecast.
她对天气预报的预测无疑是正确的。
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3. Thedecision was to a certainty made by the majority ofthe board.
这个决定肯定是由董事会的大多数人做出的。