问答题请以重庆渝华进出口公司李平的名义给上海国际公司写一封致歉信。内容如下：很高兴收到贵公司4月5日的来信。由于我方电脑系统故障原因导致延迟寄出贵方订购的玻璃杯，对此表示歉意，并保证今后不再发生此类事情。
(注意：结尾要有收信人的称谓、单位、发信人的署名等)

【正确答案】

【答案解析】Dear Sir or Madam,
We are glad to receive your letter of April 5．I am writing this to show our sincere apology for delaying to send your order of glasses. That is mainly caused by the breakdown of the computer. We ensure you here that such kind of things will not happen again.

Yours sincerely,
Li Ping
Chong Qing Yu Hua Import and Export Company