a branch of an umbel or an umbelliform inflorescence
(mathematics) a straight line extending from a point
a group of nearly parallel lines of electromagnetic radiation
the syllable naming the second (supertonic) note of any major scale in solmization
any of the stiff bony spines in the fin of a fish
cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins
动词 ray:
emit as rays
extend or spread outward from a center or focus or inward towards a center
expose to radiation
双语例句
用作名词 (n.)
The researches are concerned with alpha rays. 这些研究是关于阿尔法射线的。
The ozone layer blocks some harmful rays which the sun gives off. 臭氧层阻隔了太阳发出的一些有害射线。
