silver

silver　银　

A precious metal traded on the spot and futures markets.On COMEX，a futures contract for silver equals 5000troy ounces.Contract prices for silver move in minimum increments of$.005per troy ounce，or$25per contract.With some exceptions，the exchange will call a halt to trading on silver if the price fluctuates more than$1.50（$7，500per contract）above or below the previous day’s close.