If something is alight, it is burning.
ablaze
Several buildings were set alight.
几栋大楼着了火。
If someone's eyes are alight or if their face is alight, the expression in their eyes or on their face shows that they are feeling a strong emotion such as excitement or happiness.
She paused and turned, her face alight with happiness.
她停住并且转过身来,满脸洋溢着幸福。
alights , alighting , alighted
If a bird or insect alights somewhere, it lands there.
A thrush alighted on a branch of the pine tree.
一只画眉落在这棵松树的一根树枝上。
When you alight from a train, bus, or other vehicle, you get out of it after a trip.
get off