Urgently; Promptly; Immediately; With all speed; At once; With dispatch; With all despatch; With the quickest possible despatch; With the least possible delay; As soon as possible; As quickly as possible; As promptly as possible; At one's earliest convenience; At the earliest possible moment; At an early date; Without delay; Without loss of time; Immediately on receipt of this letter; By express messenger; By Special messenger; By special delivery; By express letter.
15回信
By return; By return of post; By return of mail; By return of air-mail.
16依照
According to; Agreeably to; Conformably to; pursuant to; In accordance with; In conformity with (to); In obedience to; In deference to; In compliance with; In agreement with; In pursuance of.
17就...，关于
About; Regarding; Concerning; As to; As regards; With regard to; In regard to;(of); Respecting; Relative to; Anent; In connection with; Referring to; With reference to; In reference to; Re.
18期满到期及应付之款
To be due; To fall due (become) due(日期将到); Duly(正时，及时);In due Course (依照顺序).
19每个，按照，通过
Per(=by, through) rail.(post,mail,steamer)(通过铁路，邮政，轮船)
Per pro.= by proxy (由代理)
Per annum (=yearly，每年)
Per mensem (=monthly,每月)
Per diem [daiem] (=daily,每日)
Per man, per capital (=per head,依照人数，每一人)
Per piece (每一个，每一件)
20表示抱歉(冒昧做了某事)
To take the liberty of doing something; To take the liberty to do something; To take the liberty in doing something.
21甚感遗憾，请包涵
To regret; To be sorry; To be chagrined; To be mortified; To be vexed; To regret to say; To be sorry to say; To one's regret; To feel a great regret for; To express regret; To be regretted; To be a matter for regret; To be regrettable; To be deplorable.
22(我们)对于……甚感荣幸
To have the honour of doing (being); To have the honour to do (be); To do one (oneself) the honour of doing (being); To esteem (regard) it as a high honour to do (be); To appreciate the honour to do (be); To feel honoured to do (be); To owe one a debt of honour to do (be); To be honoured with doing (being) something; To honour one with doing (being) something.
23请
Please; Kindly; be good enough; Be kind enough; Have the kindness.
24感谢，衷心感谢等
To thank; To be (feel) thankful; To be (feel) grateful; To be obliged; To be indebted; To esteem (it) a favour (privilege); To give (tender, return) one's thanks; To express one's gratitude (appreciation); To tender one's sincere thanks for; To be overwhelmed with gratitude.
25请照顾等
Noun: (请吩咐)Command; Order; Service
Verb: (服务)To command; To order; To serve; To be at one's service; To render service to one; To do one a service; To be of service to one.