通信 tōng xìn — to correspond (by letter etc)
tōng (first tone, high and level) xìn (fourth tone, falling)tong1 xin4
to correspond (by letter etc)
Level 3· 2021 three-band, nine-level proficiency standardverb
Meanings
to correspond (by letter etc)
to correspond (by letter etc); to communicate; communication
verb