brighten
verb [ I or T ] uk/ˈbraɪ.tən/ us/ˈbraɪ.t̬ən/
(LIGHTER)
（使）发光;（使）发亮
to (cause to) become lighter
The room was small and dark, without so much as a ray of light to brighten the gloom. 房间窄小昏暗，连一丝光线也没有。
It was rainy this morning, but it brightened up (= the sun started shining) after lunch. 今天早晨下雨，但午饭后天晴了。
(HAPPIER)
（使）快活起来;（使）充满希望
to (cause to) become happy or full of hope
Her eyes brightened when she saw him enter the room. 当她看见他进入房间时，眼睛一亮。
There are, however, one or two items of good news to brighten the economic picture a bit. 然而，总会有一两条好消息让人对经济前景有些希望。