通信网络

communications network

letter / mail / CL:封[feng1] / to trust / to believe / to profess faith in / truthful / confidence / trust / at will / at random

to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc

classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)

Internet

network (computing, telecommunications, transport etc)

net / network

to correspond (by letter etc) / to communicate / communication

small net

net-like object / to hold sth in place with a net / to wind / to twist / (TCM) channels in the human body

cell phone network