Pău-ŭk-siáng (拋物線) sê gī-hò̤ diē-sié gì siŏh cṳ̄ng uòng-chŭi-kuóh-siáng.
Găk sĕng-uăk dâi-dŏng, ciŏng nó̤h gĕ̤h chók kó̤ gì lô-géng cêu sê siŏh ciáh pău-ŭk-siáng.
Pău-ŭk-siáng gì biĕu-cūng huŏng-tiàng ô â-dā̤ gūi ciáh:
gì-dṳ̆ng, „p“ sê cūng-gău-gé̤ṳ.
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