yours

1 × Dear Sir,… Yours,

  √ Dear Sir, … Yours faithfully.

(某某先生大鉴，… 您忠实的；谨启)

When writing a formal letter beginning Dear Sir or Dear Madam, you should end it with Yours faithfully.

正式信件开始时用Dear Sir 或Dear Mandam, 其结尾应用Your faithfully.

2 × Dear Mum and Dad,… Yours, Erich.

  √ Dear Mum and Dad,… Love, Erich.

(亲爱的妈妈，爸爸，…爱您们的阿历)

Yours is often used at the end of letters to friends but NOT to parents and close relatives.

Yours 用于致朋友的信末，但不能用于致父母或近亲的信末。

摘自 《郎文常用英语正误词典》