第一来看这么一段话，来自《银河护卫队》里母亲写给星爵的信：
Peter, I know these last few months have been hard for you. But I’m going to a better place. And I will be okay. And I will always be with you. You are the light of my life. My precious son. My little Star|Lord.
Peter, 我了解近期几个月对你来讲非常痛苦，但我去了更好的地方，我会照顾好我们的。我会永远陪在你身边。你是我生命的希望，我挚爱的儿子，我的小星爵。
这里涉及了习语“the light of your life”，它的意思是“最喜欢的人”。追星少女最能理解这句话啦，“为何喜欢一个遥远的人? 由于他会发光啊!”
好的，今天就来学习和light有关的实用表达。
1. cast/shed/throw light on sth 为…提供讲解;使…较容易理解
His diary cast light on life in England in the seventeenth century.
他的日记使人知道17世纪英格兰的生活状况。
2. come to light为人所知，被披露
Fresh evidence has recently come to light that suggests that he didn't in fact commit the murder.
新近发现的证据表明那起凶杀案并非他干的。
3. go out like a light 立即入睡;立刻失去知觉
go out的意思有“出去;熄灭”，这里就用灯光熄灭的速度来比喻立即入睡的状况，非常形象吧!下面推荐的例句来自《骆驼祥子》：
When he lay down finally, he went out like a light the moment his head touched the d, and he felt it wouldn't be such a bad thing if he never woke again.
到了夜晚，头一挨地他便像去世了过去，而永远不再睁眼也并不是肯定是件坏事。
4. in the light of sth 由于，鉴于
In the light of recent incidents, we are asking our customers to take particular care of their personal belongings.
鉴于近期发生的几起事件，大家提醒客户要特别注意照看好我们的个人物品。
5. light at the end of the tunnel 隧道尽头的亮光，希望
这个习语常用来指局势出现好转或艰巨任务马上完成的征兆，不了解大伙有没看过《釜山行》。电影的最后幸存的两个人要通过长长的隧道，最后她们靠着尽头的亮光走完了隧道活了下去。
As finals approached, she felt that at last she could see the light at the end of the tunnel.
伴随考试的临近，她感觉自己终于快要熬出头了。
6. show someone in a bad light 丑化
in a bad light的意思是在看不了解的地方;在光线不好的地方。
有没听说过有一种神奇的光叫韩剧光，没了打光画面可没那样好看哦!
He was concerned that the article had shown him in a bad light.
他担忧那部影片丑化了他的形象。
以上的light都是名词含义，再来看看它的形容词和动词使用方法。
light做形容词，除去“光亮的，明亮的”的这个最容易见到意思，还有这几个含义：
1. 轻松的，愉快的
make light of sth 轻视，忽略
It is easy to make light of other people's problems.
忽略别人的问题比较容易。
2. 弱小的;少量的
light eater/drinker/smoker
饭量/酒量/烟瘾小的人
light sleeper
睡觉轻的人
3. 轻微的，轻松的，容易的
①make light work of sth/doing sth 易如反掌地做某事
Heather made light work of painting the walls.
希瑟易如反掌地刷完了墙。
②as light as a feather 轻如鸿毛
His death is as light as a feather.
他的死轻如鸿毛。
light作动词，翻译为“照亮，点亮;为…照明”，看一下这两个短语：
①light on/upon sth 忽然发现，忽然想起
We lighted upon the solution entirely by accident.
大家想起这个方法实属偶然。
②light up 使开心起来
Rosie's whole face lit up with excitement when she saw the presents.
看到礼物的时候罗茜满脸开心。
