Think of a door that only the people inside are allowed through. Behind it is the one thing that explains how the product is really made. What is sold outside is ordinary; what stays behind the door is the reason it works. Keeping the door shut is the whole point.
可以想成一扇只有自己人能進的門。門後面放著「到底怎麼做出來的」那一套方法。外面賣的東西大家都看得到。真正讓它好吃、好用的那一步，留在門後面。這個詞的重量就在那扇門上：門一開，價值就沒了。所以英文才會說 keep it a trade secret——重點不是這件事多神秘，而是「不說」本身就是保護的方法。
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