寄信

寄 jì HSK 4 #1,475

to send / to mail / to entrust / to deposit

来信 láixìn HSK 5 #5,087

incoming letter; a letter received / to write to (us/someone)

信件 xìnjiàn HSK 7 #5,797

letter / mail / correspondence

推荐信 tuījiànxìn #10,939

recommendation letter / letter of recommendation / reference letter

回信 huíxìn HSK 5 #9,406

to reply (to a letter or message) / reply letter

介绍信 jièshàoxìn #25,970

letter of introduction / letter of recommendation / reference letter

写信 xiěxìn #4,039

to write a letter

信 xìn HSK 3 #449

letter / to believe / to trust

坚信 jiānxìn HSK 7 #4,748

to firmly believe / to be deeply convinced

发信 fāxìn #14,176

to post a letter / to send a message