单词	unvariable expense
释义	unvariable expense 不变费用
随便看	secondary electron spectrum secondary electron yield secondary electroosmosis technology secondary element secondary elements secondary elevated river secondary elevation secondary elevator secondary eleventh secondary elongation secondary embargo secondaryembryo secondary embryo secondary embryocord secondary embryo cord secondary embryo-cord secondary embryogenesis secondary emision surface secondary emission secondary-emission secondary emission cathode secondary emission cathode manufacture secondary emission cell secondary emission ceramics secondary emission characteristic