給小男孩一把鎚子，他會認為所有的東西都該敲一敲。
Kaplan(1964): “Give a small boy a hammer, and he will find that everything he encounters needs pounding.” ¹⁾

若手上只有鎚子，每個東西都像是釘子。
Maslow(1966): “If the only tool you have is a hammer, to treat everything as if it were a nail.” ²⁾

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