faithfully/ 'feɪθfəlɪ /

1.adverb [serve] [ promise] [ follow+] 
(loyally) 忠实地

2.adverb [restore] [ record] [ copy+] 
(accurately) 精确地

Yours faithfully
 [BRIT] 您忠实的
3.adverb
美 = Sincerely yours