時間は最も希少な資源であり、それが管理されない限り、他に何も管理することはできない。 - ピーター・（ファーディナンド・）ドラッカー (1909 - 2005)
(Gerd AltmannによるPixabayからの画像)
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Time is the scarcest resource and unless it is managed nothing else can be managed. - Peter (Ferdinand) Drucker (1909 - 2005)
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