Comparison between a current share price, portfolio of shares or a stock index and the price of the same instrument, portfolio or index at a given time in the past.
指股票的现行价格、股票组合或某种股指，与过去某一时刻相同金融工具的价格、组合或指数间的比较。
To cultivate the right instrument of perception there must be no comparison for when you compare you cease to understand.
为了培养正确的觉知工具，不能比较。因为当你比较时，你就不在理解了。
The technical comparison shows that the laser centering instrument is superior to conventional centering methods in the installation and adjustment of equipments.
通过技术比较，证明激光对中仪用于设备的安装调试具有传统对中方法难以比拟的优势。
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