词典释义：
突然出现（或使突然出现）活跃（或欢快）的神色；眉开眼笑；喜形于色
Usually at this time the yellow light just light up.
而通常此时黄灯才刚亮起。
From bizarre antimatter to experiments that tie light up in knots, physics has revealed some spooky sides of our world.
从奇异的反物质到把光捆扎成结的实验，物理学已经揭示了我们世界的一些幽灵般的方面。
She was relieved to see his face light up with a boyish grin.
看到他脸上显出孩子气的笑容，她松了一口气。
Let's light up a big campfire to keep warm.
让我们生个篝火来取暖吧。
Do you know? It's you who light up my life!
知道吗，是你，点燃了我的生命！
light up是ニコリ公司于2001年创作的一种二进制式逻辑解迷游戏。
一首由中澳混血歌手聂杰明于2012年6月26日发行的单曲。
(with reference to a person's face or eyes) suddenly become or cause to be animated with liveliness or joy
（指脸部表情或眼神）突然出现（或使突然出现）活跃（或欢快）的神色，眉开眼笑，喜形于色
他的眼睛突然变得精神起来，微微笑了一笑
愉悦的微笑使她容光焕发。
Well, all I got upstairs is a light-up nativity and $25,000 worth of Target Christmas decorations.
而我只有发光的耶稣诞生图，还有从百货花2万5千美元买的圣诞装饰物。
《2 Broke Girls Season 4》《破产姐妹 第四季》
Are you sure? I mean, the nose doesn't light up, but if the corpse is fresh enough, sometimes you can get the leg to jerk.
确定吗？虽然鼻子不会发亮，但如果尸体足够新鲜，偶尔还是能让他腿抽抽呢。
《The Big Bang Theory Season 6》《生活大爆炸 第六季》
It's the starting point for the remarkably intricate system of generating stations and transmission lines that light up our world today.
那是最早的供电系统，最早的发电厂和线路，今天的一切由那而来。
《America Revealed》《透视美国》
