通奏低音；持续低音；数字低音

[ noun ]
a bass part written out in full and accompanied by numbers to indicate the chords to be played
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Basso \Bas"so\, n. [It., fr. LL. bassus. See {Base}, a.] (Mus.)
(a) The bass or lowest part; as, to sing basso.
(b) One who sings the lowest part.
(c) The double bass, or {contrabasso}.

{Basso continuo}. [It., bass continued.] (Mus.) A bass part
written out continuously, while the other parts of the
harmony are indicated by figures attached to the bass;
continued bass.