The demand constraint is a little bit different than the previous two, because it's defined for each kind of toy, not as a total for all toy types.
需求约束与上面两个约束有所不同，因为它是为每种玩具而定义的，而不是为所有玩具类型总和进行定义的。
The demand constraint is a little bit different than the previous two, because it's defined for each kind of toy, not as a total for all toy types.
需求约束与上面两个约束有所不同，因为它是为每种玩具而定义的，而不是为所有玩具类型总和进行定义的。
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