最后，克罗斯比说，投资者正在关注S$P500强的关键技术水平，周五已经接近其最近的成交价幅度的谷底。

To that end, Krosby said investors are watching key technical levels on the S&P 500, which closed near the bottom of its recent trading range Friday.

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涨跌停机制是对证券的每日最高和最低成交价，或每日最高涨跌幅度进行的限制，旨在降低股市波动，提高市场效率。

The price limiting mechanism (PLM) aims to limit the range of daily fluctuations of stock prices in order to reduce stock market fluctuation and enhance market efficiency.

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