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初至 S 波
eng.geol. initial S wave
初至 P 波
eng.geol. initial P wave
初至波 chū zhì bō
expl. first arrival
oil first break; first arrival wave
space primary wave
tech. first-motion wave; preliminary wave
初至 S 波: 12 phrases in 3 subjects
Engineering geology2
Oil / petroleum8
Technology2