photo finish (in horse racing)

finish of a race where the leading horses are so close together that only a photograph of them passing the winning-post can show which is the winner （马赛中的）摄影定名次（参赛者到达终点时需藉照片判断名次者）.

phonetic (K.K. Consonants), phonetic (K.K. Vowels), phonetically, phonetician, phonetics, phoney (also phony), phonic, phoniness, phonograph, phonological, phonologist, phonology, phooey, phosgene, phosphate, phosphorescence, phosphorescent, phosphoric, phosphorus, photo, photo-, photocell, photochemical, photocopier, photocopy, photoelectric, photogenic, photograph, photographer, photographic, photographically, photography, photolithography, photon, photorespiration, photosensitive, photosensitize, photosensitise, photostat, Photostat (also photostat), photostatic,