【来源及含义】Greek: triangular; fourth letter; Δ, δ, of the Greek alphabet
【同源单词】delt, delta, Delta Aquarids, delta bar, delta connection, delta flat
【来源及含义】Greek: triangular; fourth letter; Δ, δ, of the Greek alphabet
【同源单词】delt, delta, Delta Aquarids, delta bar, delta connection, delta flat