圆周率 pi ; circular constant

圆周率日 Pi day ; National Pi day

振荡周率 Oscillation frequency

系统周率特性 system frequency characteristic

圆周率浴帘 pi shower curtain

存货周转率 inventory turnover ; stock turnover ; rate of stock turn

低周率继电器 low frequency relay

资产周转率 [会计] Asset turnover ; Total Asset Turnover ; asset turns ; assets turnover ratio

资本周转率 capital turnover ; turnover of capital ; net worth turnover ratio