The concept of cutting tool life-cycle management was put forward, and divided it into four phases: planning period, input time, serviceable life and discarding period.

提出了刀具全生命周期管理的概念，将刀具全寿命周期管理划分为计划期、投入期、使用期、报废期四个阶段。

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The four-period-life-cycle theory was once used by scholars to analyze the procedure of the management of the SARS crisis in China.

四生命周期理论的分析学者曾经用过的程序SARS危机的管理在中国。

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The best 30 funds in each cycle averaged annual gains of 28.3% in the four-year period in which they led the pack.

FORBES: Swear Off Individual Stocks For Better Returns