（4）请原谅我的回信延迟
1. Please excuse my late reply to your very friendly letter of March 1.
2. I hope you will forgive me for not having written you for so long.
3. I hope you will excuse me for not having replied to you until today.
4. I humbly apologize you for my delay in answering to your kind letter of May 5.
5. I have to (must) apologize you for not answering your letter in time.
6. I must ask you to kindly accept our excuses, late as they are.
（5）我们对您的关照，谨致谢意
1. We request you to accept our warmest thanks for the anticipated favour.
2. We thank you in advance for the anticipated favour.
（6）我们时刻不忘尽我们所能，为您服务，等。
1. We assure you of our best services at all times.
2. We shall spare no efforts in endeavouring to be of services to you.
3. We shall be pleased to be of service to you at all times.
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责任编辑：虫虫
