昨天在香港早市的交易中，黄金被报出每盎司$368.20的牌价。
In early trading in Hong Kong yesterday, gold was quoted at $368.20 an ounce.
因此矿工约翰可以用他的十盎司黄金换取更多的土豆和西红柿。
As a result John the miner can exchange his ten ounces of gold for more potatoes and tomatoes.
例如，合同大小规定黄金期货是100盎司。
For example, the contract size for gold futures is 100 ounces.
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