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此处“this”在是用来指代前面所说的“producing more of a commodity results in reducing its cost”（大量制造某种商品导致成本下降）这件事。
此处“this”在是用来指代前面所说的“producing more of a commodity results in reducing its cost”（大量制造某种商品导致成本下降）这件事。
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