(美亦作 sincerely yours)a formula used to end a letter, typically a formal one in which the recipient is addressed by name你诚挚的（信末署名前的套语，多用于以名字称呼收信人的正式信函中）
柯林斯高阶英汉双解学习词典释义
ADV-GRADED
真诚地;诚实地
If you say or feel something sincerely, you really mean or feel it, and are not pretending.
例句
'Congratulations,' he said sincerely...“祝贺你，”他真诚地说。...sincerely held religious beliefs...虔诚的宗教信仰
CONVENTION
谨上，此致(正式信件中写在姓名前的客套用语)
In Britain, people write 'Yours sincerely' before their signature at the end of a formal letter when they have addressed it to someone by name. In the United States, people usually write 'Sincerely yours' or 'Sincerely' instead.
例句
Yours sincerely, James Brown.谨上，詹姆斯·布朗
英汉词典释义
adv.
真心实意地，真诚地，诚实地
I sincerely hope that you will be successful.我衷心祝愿你成功。I sincerely pity these unfortunate beings.我真诚地同情这些不幸的人。
英英词典释义
Adverb
1. with sincerity; without pretense;
"she praised him sincerely for his victory""was unfeignedly glad to see his old teacher""we are truly sorry for the inconvenience"