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1·The engineers are also trying to develop an on-and-off switch where the glow would fade when exposed to daylight.

工程师们还试图研制一种间断式“开关”，当暴露在日光下时，光照会逐渐消失。

2·When you turned the knob to switch it on, an orange glow would gradually light up a darkened room on a winter's evening.

当你扭开旋钮，一道橙色的亮光会逐渐照亮一个冬季傍晚的漆黑房间。