He firmly believes that education and a country's economic development are key factors to progress.
他坚信教育和一个国家的经济发展是通向进步的关键因素。
He firmly believes that she is innocent of the crime.
他坚信她是清白的。
He firmly believes that his work experience will make him competent on the position.
他坚信自己的工作经验会让他胜任这份工作。
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