名词
中文翻译：身份证明信
同义词：
['certificate of identity', 'identification document', 'proof of identity']
例句：
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1. He requested a copy of his letter of identification for the meeting.
他要求复印一份他的身份证明信参加会议。
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2. The police officer needed to see the letter of identification before they could release him.
警察需要查看身份证明才能释放他。
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3. Before leaving the country, it is important to have a valid letter of identification.
离开国家之前，拥有有效的身份证明是很重要的。