Last December, the Australia-based company Invetech reported that it had delivered the world's first production model 3-D bio-printer for Organovo.

VOA: special.2010.10.19

But we'd like a model that yields an outcome that looks-- that when you only have two firms looks somewhere between monopoly and perfect competition.

但我们想要一个模型能带来这样的结果,即,当只有两家公司时,一个介乎于垄断和完全竞争之间的情形

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