换句话说，格鲁伯是一个真正的权威，显然是填补需要的合适人选。
In other words, Gruber is a real authority, and the obvious person to fill a needed role.
既然格鲁伯在提供这类技术咨询，那么，他是否应该完全回避公共辩论？
Given that Gruber was providing this kind of technical consulting, should he have recused himself entirely from the public debate?
格鲁伯已花费数年建立这样一个模型，它的维持和更新都花费了相当大的代价。
Gruber has spent years developing such a model, which is maintained and update at considerable expense.
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