韩国综合指数下跌3.7%，以20个月来的最低价收盘。
South Korea’s key KOSPI index dropped 3.7 percent to finish at its lowest mark in 20 months.
道琼斯工业指数、S&P500和纳斯达克均以2011年最低价收盘。
The Dow Jones industrial average, S&P 500 and Nasdaq all ended at their lowest levels of 2011.
每Trace对象包含一组Day对象，定义了当天的最高价、最低价和收盘价。
Within each Trace object is a set of day objects, which define the low, high, and close for that day.
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