versed
adjective formal uk/vɜːst/ us/vɝːst/
be versed in something 对…很熟练;通晓;精通
to know a lot about a particular subject or be experienced in a particular skill
I'm not sufficiently versed in XML to understand what you're saying. 我对可扩展标记语言不太精通，听不懂你的话。
Synonym: knowledgeable
Opposite: unversed
See also: well versed