Think of a fenced field kept for one purpose: you take something out there, run it hard, and find out what it really does. Everything this word means comes from swapping what you put on that field — a tractor, a plan, or a person — while the field itself stays the same: a bounded place where the truth comes out.
一塊圍起來的空地，這塊地只有一個用途：把東西拉出去，操到底，看它到底行不行。這個詞的每個意思，都只是換了場上那樣東西——換成曳引機、換成一套新做法、換成一個人。地沒有變，變的是被試的對象。所以三個意思其實都在講同一件事：這裡會逼出真相。也因為這樣，句子裡的 for 特別重要，它就是在指「這次拉上場的是什麼」。
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