率 - ratio, rate, proportion

interest rate

efficient

rate; ratio; proportion; percentage

efficiency

high rate

rate of economic growth

death rate; mortality rate

ratio; proportion; percentage

to lead; to spearhead (a group); to command (troops)

magnification; leverage; amplification; scaling factor; scale factor

operating rate; utilization rate; occupancy rate; availability factor

ratings (e.g. of a television program); audience rating; viewing rate