tōng​xiǎo

proficient

通晓 (通曉) tōng​xiǎo
proficient verb
having a thorough knowledge of a subject, field, or language

He is proficient in several foreign languages and navigates international communication with ease.

understand verb
to understand something thoroughly or through and through; to have deep comprehension

Only by mastering the basic principles can one solve more complex problems.

Frequency

Movie subtitles
1.34 per million appears in 0% of films
Written text
0.883 per million

Sources

Definitions
CC-CEDICT