This particular board also operated over a broad temperature range without a cooling fan.

这块系统板不用制冷风扇就可以在温度变化很大的环境中使用。

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Hardening. This is the process of heating to a temperature above the critical range, and cooling rapidly enough through the critical range to appreciably harden the steel.

淬火。这个工艺是把材料加热到临界温度范围之上，然后迅速冷却到临界温度范围以下，使钢材明显变硬。

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This reduces the pressure back to a normal range which is ideal for optimum cooling of the evaporator.

结果是减小压强至正常范围，创造蒸发器的最佳冷却压强。

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A123 points to a recent breakthrough with batteries that can work in a wide range of temperatures without the need for external cooling or heating.

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Its two selling points are an extended battery range of 120 miles rather than 100, and onboard battery heating and cooling, which should extend the life of the pack.

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