conversant
adj[pred 作表语]
~ with sth (fml 文) having knowledge of sth; familiar with sth (对某事物)精通, 熟悉
thoroughly conversant with all the rules 对所有的规则了如指掌.
There is always hope that in its labyrinth of musty, dark, disordered rooms a real rarity will be found amongst the piles of assorted junk that little the floors.