本周四是圣诞假期前最后一个交易日，美国股市交易量预计有所减少。

Thursday is the last trading day before the Christmas holiday, and volume is expected to be thin.

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在本年度最后一周中，美国股市交易量清淡。

The last week of the year has been marked by thin trading.

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最后，通过建立数理模型、实证分析来说明交易成本对股指期货市场交易量和波动性的影响。

Finally, through mathematical models and empirical analysis we will discuss the cost impact on trading volume and volatility in stock index futures market.

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