资料来源 : Free On-Line Dictionary of Computing

binary tree
     
        (btree) A {tree} in which each node has at most two successors
        or child nodes.  In {Haskell} this could be represented as
     
        	data BTree a = NilTree
        		     | Node a (BTree a) (BTree a)
     
        See also {balanced tree}.
     
        (1994-11-29)