lit up是什么意思啊?

v.点火(点灯,变快活)
例句与用法:
1.Bob lit up one of his best Havana.
鲍勃点燃了一只他最好的哈瓦那烟.
2.A few faint gleams of sunshine lit up the gloomy afternoon.
有几束隐约的阳光使阴暗的下午有些明亮.
3.A rare smile lit up his stern features.
他那难得一见的微笑在他死板的脸上平添一些生气.
4.Her eyes lit up with joy.她因喜悦而目光炯炯.