求翻译：安装地点的空气相对湿度在温度为 + 40^时不超过50% ；在较低温度下可 以有较高的相对湿度，例如20°C时达到 90%。对由于温度变化偶尔产生的凝露应采取特殊的措施；是什么意思？

Installation site of the air relative humidity at a temperature of + 40 ^ does not exceed 50% ; at lower temperatures can have a higher relative humidity , for example up to 90% 20 ° C at .

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Installation site air relative humidity when temperature for + 40^ does not surpass 50%; May have the high relative humidity under the low temperature, for example 20°C when achieves 90%.To because the temperature change occasionally produces congeals the dew to be supposed to take the special measu

Installation location of the air relative humidity does not exceed 50% when the temperature is + 40^; at lower temperatures can have a higher relative humidity, for example 20 ° c at 90%. To occasionally generate condensation due to temperature variation shall take special measures;

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