0 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
1 a small amount of a feeling that makes you feel happier or more full of hope -- 一线，少量的（积极情感或希望等）
2 a large, flat sea fish with a long, narrow tail -- 鳐
3 the musical note re -- 长音阶第二音；C大调第二音（同 re）
The room was small and dark, without so much as a ray of light to brighten the gloom.
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.
In the last two cases the image ray visits only finitely many times.
This is not to say that the visual ray account really does reduce spatial perception to immediacy.
A unique subtype of wide-field amacrine cell region corresponding to eccentricities of 0.6-2.5 mm from the medullary rays.
