海面上升还是下降了?
Every day hundreds of individual companies may rise or fall by a little or a lot. The same is true for whole sectors.
每天几百家单个公司涨落不一,整个板块也是这样。
The volatility created by declining stocks is in turn compounded by speculation - traders betting on the rise or fall of prices.
投机加剧了储备减少引起的波动。投机商靠搏未来价格涨跌获利。
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