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VERB
开颜；露出喜色；快乐起来
If someone brightens or their face brightens, they suddenly look happier.
例句
Seeing him, she seemed to brighten a little...
看到他后，她似乎露出点儿喜色。
'Oh, we'd love to!' cried Nancy, her face brightening.
“哦，我们很乐意！”南希面露喜色，大声说道。
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VERB
（眼睛）发亮，放光
If your eyes brighten, you suddenly look interested or excited.
例句
His eyes brightened and he laughed...
他眼睛一亮，笑了起来
Her tearful eyes brightened with interest.
她含着泪水的双眼因为好奇而闪闪发亮。
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VERB
使生色；为…增辉添彩
If someone or something brightens a place, they make it more colourful and attractive.
例句
Tubs planted with wallflowers brightened the area outside the door.
桂竹香盆栽为门外的景致增色不少。
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V-ERG
（使）好转；（使）变得乐观
If someone or something brightens a situation or the situation brightens, it becomes more pleasant, enjoyable, or favourable.
例句
That does not do much to brighten the prospects of kids in the city...
那并不能使城里孩子们的前途更光明些。
It is undeniable that the economic picture is brightening.
不可否认经济状况正在好转。
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V-ERG
照亮；（使）变明亮
When a light brightens a place or when a place brightens, it becomes brighter or lighter.
例句
The sky above the ridge of mountains brightened...
山脊上方的天空变得明亮起来。
The late afternoon sun brightened the interior of the church.
傍晚的太阳照亮了教堂内部。
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VERB
（天气）放晴
If the weather brightens, it becomes less cloudy or rainy, and the sun starts to shine.
例句
By early afternoon the weather had brightened.
中午刚过，天就放晴了。