The S&P/Case-Shiller index, which tracks home prices in 20 cities, ticked up slightly in May, its first gain in 34 months (see chart 1, left-hand side).

“标普/Case-Shiller”指数跟踪20个城市的房价。 该指数五月份略微上翘，这是其34个月以来的首次上升（图1左）。

The chart also displays the S&P 500's volatility, as determined by its swings during the past 30 trading days.

这张图上也标示了过去30个交易日里SP500指数的波动性。

In combination with the production practice, the application and operation of P-control chart in electrolysis RE metals production is introduced.

结合生产实际，介绍了p控制图在稀土金属电解生产中的应用实例及操作步骤。