形容词
中文翻译：确定的
同义词：
['definite', 'definite', 'positive']
例句：
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1.I am certain that he will arrive on time.
我确信他会准时到达。
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2. The weather forecast is certain to be accurate.
天气预报肯定准确无误。
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3. He was certain that the meeting would take place as scheduled.
他确信会议将按计划进行。