名词
中文翻译：第一级保险费
同义词：
['primary premium', 'first charge']
例句：
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1.The company offers a first-class service to all its customers.
该公司向所有客户提供一流的服务。
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2. The first premium is usually paid in advance.
首期保费通常需要提前支付。
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3.The insurance company will assess the first premium based on the risk level of the policy.
保险公司将根据保单的风险等级评估首期保费。