indices of crystal plane

例句：

1. 1. The indices of the economy arerising steadily.
   经济指数稳步上升。
2. 2. The company's stock price is closely tied toits indices.
   公司的股票价格与其指数密切相关。
3. 3. The index of happiness has been onthe rise for several months now.
   幸福指数已经连续几个月上升。