你不必放弃做一个积极型投资者，但要考虑放弃选个股，换一些更简单的选择，如指数型基金。
You don't have to give up being an active investor. But consider ditching individual stocks in favor of easier choices like index funds.
本文使用刀具磨损过程的能力指数，得到满足顾客要求的最小过程能力指数的换刀时刻。
The paper USES process capability indices for tool wear processes, from which the tool replacement time that meets the needs of customers for minimum process capability indices is obtained.
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