Think of a mechanic walking round an engine that already works, touching one small thing after another until it runs smoothly. Nothing is broken; it is being brought up to its best.
可以想成一位技師繞著一具本來就能動的引擎，一個小地方接一個小地方調整，直到它跑得順為止。沒有東西壞掉，只是把它調到最好的狀態。
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