sub·dom·i·nant /ˌsʌbˈdɑmnənt, ˈdɑmə-/
次屬音(a.)占第二位優勢的
Sub·dom·i·nant n. Mus. The fourth tone above, or fifth below, the tonic; -- so called as being under the dominant.
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subdominant
n : (music) the fourth note of the diatonic scale