"黃金早就是各國央行的主要儲備資產了"
How about the Federal Reserve? BOE? BOJ? PBOC? What percentage of their reserve assets is gold?
After the central banks, it will be the turn for the commercial banks. Turkey has made an early start: http://alternativeeconomics.wordpress.com/2012/03/27/turkish-central-bank-backs-gold/
