n.
四拍子, 每小节以四拍为基础的拍子

[ noun ]
a time signature indicating four beats to the bar
<noun.time>

Quadruple \Quad"ru*ple\, a. [L. quadruplus, from quattuor four:
cf. F. quadruple. See {Quadrate}, and cf. {Double}.]
Fourfold; as, to make quadruple restitution; a quadruple
alliance.

{Quadruple time} (Mus.), that in which each measure is
divided into four equal parts.