单词	aged-child ratio
释义	aged-child ratio 老龄化指数
随便看	rack-and-pinion gate rack and pinion gate lifting device rack and pinion gear rack-and-pinion gear rack and pinion gearing rack and-pinion gearing rack-and-pinion gearing rack-and-pinion gearingrack gearing rack and pinion hoist rack and pinion jack rack-and-pinion jack rack-and-pinion J-Horner rack and pinion loom rack and pinion mechanism rack and-pinion mechanism rack and pinion motion Rack and Pinion Power System rack and pinion press rack-and-pinion press rack and pinion rotation mechanism rack and pinions rack-and-pinions Rack and pinion steering rack-and-pinion steering rack -and -pinion steering