Casual or Business casual. A more personal, but still polite way to end the letter. You've probably met the recipient in real life.

用Yours之类的环境是比较放松的，发件人和收件人大概是已经碰过面的哦~

Casual, Business casual or Formal. The standard letter ending.

'Sincerely' is the most versatile ending because it can be used to end either casual or formal correspondence. If you're unsure about how to sign your letter, use 'Sincerely'.

可随意可正式的用语，如果你不确定用什么结尾，这几个词会是你最好的选择。

Casual or Business casual. A polite way to end the letter. Can be used between friends or strangers.

这种说法偏随意，却也礼貌，既可以用在朋友之间也可以用给陌生人。

Business casual or formal. You would use this if the recipient is someone you haven't met in real life.

商业用语，发件人和收件人通常素未谋面~

'Thanks' is very casual and 'Thank You' is formal.

Usually used in a business setting. 'Thank You' is a great way to end an email to a stranger, especially if you are making a request or asking a question.

Thanks 是随意，Thank You 是正式用法，且很适合用在给陌生人的信件结尾处。

Very personal. Used between lovers, family and close friends.

这可是私房用词，仅限最亲密的人使用。

Very casual. Used between friends. Can be used between coworkers if you want to appear very casual, at the risk of sounding unprofessional.

很随意的讲法，可在同事和朋友之间用，不过小心哦，听上去可很是不专业呢~

Casual and used between friends.

朋友间的随意用语。

Formal. Used in business correspondence when the topic of the letter is serious. Sometimes used if there is a conflict between the senderand the recipient.

超正式用语，一般用不上。。。


请大家继续琢磨~

所以呢，Yours，Sincerely，Truly ，Regards等词汇所透露给读信人的潜在信息是不同的。在具体使用过程中，写信人需要根据与读信人的关系以及具体使用场合相结合。