levyn.征税；召集vt.征收；发动vi.强收levy tax essential factors课税要素Levy taxes according to law依法收税levy and supervision of tax税收征管Levy social security tax.开征社会保障税。levy taxes according the law依法收税levy in mass/levee en masse全国总动员Levy Rowntree-Marriott method雷-马二氏法:检血中氢离子浓度Levy process with positive jumping带正跳的列维过程Levy on futures contract liability负债;法律责任;应履行的责任Levy-Rowntree-Marriott's method伦理危机