Sentence:A lamp holder [e1]structure[/e1] of the present invention is comprised of: a cup-shaped [e2]base[/e2]; a circuit board and two elastic conducting devices mounted inside the cup-shaped base; and at least one light-emitting device mounted on the circuit board.
 e1: structure. 
 e2 : base.
Answer: Component-Whole(e2,e1)