名词
中文翻译：Unknown
同义词：
['surety', 'assurance', 'certainty']
例句：
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1.The company will pay a certain annuity to the retiree every year.
公司每年将向退休人员支付一笔年金。
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2. He made a certain annuity for his daughter's education.
他为女儿的教育设立了一笔年金。
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3. The government has assured the public of its certain annuity for unemployment benefits.
政府已向公众保证，对于失业救济金有一份确定的承诺。