两家公司耗费数月时间决定究竟是升级发动机，还是投入更多时间和资金来设计全新机型。

Both have spent months trying to decide whether to re-engine their jets or spend more time and money building an all-new aircraft.

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例如，买方和卖方动机的形成、筹措资金、机器现状等等，这些明显影响价值的知识是未知的。

Such things AS the motivation for buyers and sellers, financing, and condition of a machine, which obviously have an effect on value, are unknown.

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这也可以动机的事实是，企业家还需要花一些时间和精力，在筹集资金，而在同一时间内对她的工作项目。

This can also be motivated by the fact that the entrepreneur still needs to spend some time and effort in raising funds, while at the same time working on her project.

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