Picture a ladder of steps with something placed on one of them. Low-grade says the thing sits near the bottom step. The ladder itself changes with the subject — how good a material is, how serious an illness is, how a road rises — but the word does the same job every time: it points at the low end and leaves the middle and the top for other words.
可以想成一把一階一階的梯子，東西被放在其中一階上。low-grade 說的就是：它被放在靠底部那幾階。梯子本身會隨著主題換——材料有多好、病有多嚴重、路爬得多陡——但這個字每次做的事都一樣：指著低的那一端，把中間和上面留給別的字。也因為它像在報「第幾階」，聽起來比較像在標示等級，而不像在罵人。
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