light up
1．fill with light；illuminate brightly or extensively 照亮
The searchlight lit up the whole area．探照灯把整个地区都照亮了。
The house was all lit up as though a big celebration was going on．满屋灯火通明，宛如在进行一场大庆典。
The streets were well lighted up．街上灯火辉煌。
2．switch on the headlights of a motor vehicle at dusk；switch on the street lighting（黄昏时）打开车灯；开亮街灯
It's seven o'clock，and still one or two cars haven't lit up．已经 7点钟了，仍有个别车辆没有开灯。
At this time of the year，the official hour to light up is sixthirty．在这个季节，规定开街灯的时间是6点半钟。
3．light a pipe，cigarette or cigar 点上烟斗、香烟或雪茄
I had difficulty lighting up my cigarrette in the strong wind．刮这么大的风，我很难点着烟。
The two men lit up their pipes and then sat down for a chat．两个人点上烟斗，坐下来谈心。
As soon as the meal was over all the smokers lit up．一吃完饭，所有抽烟的人都点上了烟。
4．suddenly look pleased and happy；become cheerful 突然高兴；面露喜色
Her face lit up with joy when she heard the good news．当她听到这则好消息时，面露喜色。
Tom will surely light up when he sees his new bike．汤姆看到他的新自行车时，必定很高兴。
Her face lit up with happiness．他脸上喜气洋洋。