[4] " Person who is appointed by court to exercise certain judicial powers，to take testimony, to hear parties, and report his findings. He is an officer exercising judicial powers, and is an arm of the court for a special purpose. ”Cf. The Publisher's Editorial Staff, Black's Law Dictionary, abridged 6th edition, at p. 886, West Publishing Co. (1991).

[5] “A person having authority to decide finally a controversy or question between parties, as one appointed to decide between disagreeing arbitrators. B Cf. Linda Picard Wood, J. D. Merriam Websters Dictionary of Law, at p. 510，Meniam-Webster, Incorporated Springfield ,Massachusetts (1996). “An impartial person appointed to make an award or a final decision, usu. when a matter has been submitted to arbitrators who have failed to agree. ” Cf. Bryan A. Gamer, Black's Law Dictionary, 7th edition, at p. 1525, West Group(1999)