Purchase Request Process System采购过程系统 Pasir Ris Primary School (Singapore)小学(新加坡;Ris) Poplar River Power Station杨河电站 Pseudo-Random PRF Stagger伪PRF东倒西歪 Pasir Ris Primary School;Ris小学 phosphoribosylpyrophosphate synthetase磷酸核糖焦磷酸合成酶 Power Plus Corporation电力加上公司