B2 [ C ] a narrow beam of light, heat, etc. travelling in a straight line from its place of origin光线,光束;(热能等的)辐射线
to stay outside in the sun for a period of time晒一会儿太阳
More examples
The room was small and dark, without so much as a ray of light to brighten the gloom.
The letter offered us a ray of hope.
The alarm emits infra-red rays which are used to detect any intruder.
Through the window came the last few oblique rays of evening sunshine.
A few rays of sunlight pierced the smoke.
[ C ] a large, flat sea fish with a long, narrow tail鳐
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