Meaning of tōng xìn:
tōng xìn
通信
Verb
to correspond (by letter etc); to communicate
Wǒmen zài dàxué bìyè hòu yīzhí tōngguò diànzǐ yóujiàn tōngxìn.
我们在大学毕业后一直通过电子邮件通信。
We have been corresponding via email since our college graduation.
Zài zhège shùzì shídài, tōngxìn biàn de bǐ yǐwǎng gèng jiā zhòngyào.
在这个数字时代，通信变得比以往更加重要。
In this digital age, communication has become more important than ever.
Noun
communication
Xiàndài kējì ràng rénmen zhījiān de tōngxìn gèngjiā biànjié.
现代科技让人们之间的通信更加便捷。
Modern technology makes communication between people more convenient.
