Generally, you write one unit test per model.

一般情况下，要为每个模型编写一个单元测试。

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In the classical ruin model, it is assumed that the insurers premium income is a constant at per unit time.

经典的破产模型都是假定保险公司按照单位时间常数速率收取保险费。

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The expected cost per unit -time for infinite time span is analyzed strictly under the mathematical model constructed, and the optimum age replacement decision is also discussed.

在建立数学模型的基础上，分析了系统长期单位时间内的期望费用，并讨论了最优年龄替换决策。

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The way providers are receive their cut of the shared savings is by receiving an increase in the per unit reimbursement in the fee for service model.

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For authors and publishers, the agency model provides them with greater control over the timing of their promotions and higher per-unit earnings of 70% of the list price as opposed to 50% for the conventional wholesale pricing model.

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"The successful resolution of this case is a critical step in our overall strategy of enforcing and monetizing our intellectual property, including Basic Haptics, and we're pleased to achieve a settlement that is consistent with our business model, which is largely based on per unit running royalties, " said Immersion CEO Victor Viegas.

ENGADGET: Google settles patent lawsuit from Immersion over Motorola use of haptic feedback