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
動詞 ray:
emit as rays
extend or spread outward from a center or focus or inward towards a center
expose to radiation
造句
用作名詞(n.)
The researches are concerned with alpha rays. 這些研究是關于阿爾法射線的。
The ozone layer blocks some harmful rays which the sun gives off. 臭氧層阻隔了太陽發出的一些有害射線。