跪求英语达人帮忙写封英文信，内容见问题补充。叩谢！

Dear 客人名字：

We are pleased to have received your email. But I am afraid that we couldn't understand what you mean by CBM 1.33 in your previous email. If you can send us a more detailed explaination about it, we will try to answer it for you. Additionally, we can guarantee to complete your order within 30 days after the 20% deposit is received by us. If you have any more questions, please do not hesitate to ask.

Sincerely,

你的名字（你如果叫陈明就写 ming， 如果是公司就写公司吧）

ps.我上面是以公司的语气写的 如果你是个人的话 我再帮你改一下

Dear Mr. or Madom:
I'm very glad to receive your letter,but I'm so sorry that I can't understand the meaning of CBM 1.33 in your letter. in addition,we can finish your order form in 20 days from the date you paid 20% front money.
thanks