So, then, what is the optimal level of a currency's price?

那么，什么是一国货币的最优价格水平？

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"An optimal level of stress and anxiety keeps you energized, focused and motivated," says Dr. Kase.

凯思博士表示：“压力达到最佳水平能让你保持活力，集中注意力，有上进心。”

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We don't have a reason to assume that the current distribution of cognitive abilities is at an optimal level.

我们没有理由认为目前的认知能力分布处于最佳水平。

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There may be an optimal level of protein production inside brain cells needed for learning.

FORBES: Magazine Article

Full employment, the optimal level of jobs in an economy, is usually cited as 5% to 6%.

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The optimal level of investment is the rate that generates the highest sustainable level of consumption over time.

ECONOMIST: Economics focus