Tsit-sok-thung-vu?t-mun (脊索動物門, Chordate) he Thung-vu?t-kie chui ko-ten ke mun. Thung-vu?t poi chet yu yit-thiau tsit sok, fun-vi sam-ke A-mun , khi-chung mi sok thung-vu?t A-mun lau theu sok thung-vu?t A-mun cho-tet ha?p-chh??n-vi “ ngien sok thung-vu?t ”. Ki-teu khiung-thung thi?t-ch??n pau-koat: chhai sang-fa?t s?? chung ke meu ke kie-thon khi-yu Tsit-sok , chung khung ke poi s??n-kin kon, Yen-soi-lie?t yi-khi?p kong heu mi. Seu-su Ho?k-cha thi-chhut chiong Pan-sok thung-vu?t-mun ya tsi yi Tsit-sok-thung-vu?t-mun ha, pin miang-miang vi khieu sok thung-vu?t a mun .

Tsit-sok-thung-vu?t-mun Chordata cho-tet fun-vi sam-ke a mun: mi sok thung-vu?t a mun , theu sok thung-vu?t a mun fo Tsit-tshui thung-vu?t a mun . Mi sok thung-vu?t yu-chhung khi khi-yu tsit sok fo s??n-kin sok, than chhai s??n thi seu s?t. Theu sok thung-vu?t chung sang po-liu tsit sok fo s??n-kin sok, than mo tsit chhu . Chhai Tsit-tshui thung-vu?t chung, tsit sok ke chok-yung yu kut ch?t tsit chhu thoi thoi. Thung-song sot ke Tsit-tshui thung-vu?t-ho?k he ch?? ngien-kiu tsit sok thung-vu?t ke yit-ke Thung-vu?t-ho?k fun-ki, yi fi kiun ngien-kiu Tsit-tshui thung-vu?t a mun. Hien-chhun ke tsit sok thung-vu?t ch??-kien ke koan-he yi ha-mien ke hi-thung fat-sang su so s?. Ki fo chhon-thung ke fun-lui lui-khiun mo ch??n-ho ke vut ha?p, so-yi tui Tsit-tshui thung-vu?t ke fun-lui han chhun-chhai chang lun, chhin-kon ki-teu kien ke koan-he yi-kin kau tet han chhin-chhu liau.