certainty, assurance, conviction
这些名词均含有“确信无疑”之意。
certainty : 指在客观上和主观上都无一丝一毫的怀疑。
It's a dead certainty that this horse will win the race.（这匹马在比赛中获胜是必定的。）
assurance : 侧重依靠个人力量、本能、方法或对其他人或事的完全信任，强调有信心。
The young teacher lacked assurance in front of his class.（这位青年教师在学生面前缺少自信心。）
conviction : 多指在理性基础上清除了原有的疑虑或无把握，着重对证据的主观反应。
She's a woman of strong convictions.（她是一位信念坚定的妇女。）
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