白天在家里使用蓝光度较高的节能灯是个好主意，在晚上则使用蓝光量可能最低的节能灯。

At home, it is a good idea to use energy-efficient lamps with a higher proportion of blue light during the day, and in the evening use ones with the lowest possible amount of blue light.

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介绍了721型分光光度计，灯电源电路和稳压电路故障现象，分析了故障产生的原因，提供了排除故障办法，对该仪器维修提供了借鉴的经验。

This paper introduced some common faults of 721 spectrophotometer, found out the cause of formation, and presented fixing method, it may be used for instrument maintenance for reference.

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另一些相机会关闭闪光灯，快速连拍几张曝光度不一的照片，然后把这些图像合并起来，拼成一张曝光均匀的照片；

Other cameras turn off the flash and take several shots in rapid succession at different exposure levels, and then combine the images to create one evenly exposed shot;

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