The number of transactions involving oil futures on the New York Mercantile Exchange (NYMEX), the biggest market for oil, has almost tripled since 2004.
2004年以来，最大的石油市场，纽约商品交易所的石油期货交易增长了两倍。
The futures market is faced with much more risk due to the speculative transactions, the continuity of the price changes and margin leverage compared with the spot market.
期货市场由于存在交易的投机性、价格变动的连续性和保证金杠杆作用，使其相对于现货市场而言具有更高的风险。
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