从中央银行资产负债表分析，买卖黄金也是扩大或收缩国内货币供应的手段。
Judging from the balance sheet of central bank, gold market operation also plays a role in the expansion or contraction of money supply.
进一步讲，黄金在当今不仅禁止买卖，储存也成本很高，需要放在看守严密的保险箱内。
Further, gold is not only prohibitive to purchase these days; it's expensive to keep, lying in a guarded safe-deposit box.
他在伦敦黄金市场和白银市场上进行投机买卖。
He made his money speculating on the London gold and silver markets.
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