指当市场出现严重的压力压抑价格时，投资人为了防止股票、债券、期权、期货或其他任何形式的商品或金融工具的价格的进一步下跌而出现的大量抛售。
It occurs when the price is under serious market pressure to prevent the further falling of price of financial products or instruments such as stocks, bonds, options, futures and of other forms.
差价合约可以反映股票或指数的价格变化并提供价格变动所带来的盈利或亏损，而无须实际拥有股票或指数期货。
CFD could reflect the price changes of stocks or indexes and offer the profits or losses brought about by price fluctuations, without possessing the stocks or index futures actually.
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