parent: n.1.父亲;母亲。2.〔pl.〕双亲;祖先。3.(动、植物的)母体,亲本。4.根源,本源。5.保护者。短语和例子one's parents 双亲。 parent-teacher association 【教育】家长会。 aparent bird 老鸟。 a parent company 母公司。 parent substance 亲体,母物。 a parent stem
( 3 ) the possible mechanism of dissociation / ionization is analyzed . it can be concleded that the main dissociation channel is resonant photoionization of parent molecule followed by photodissociation of parent ion and the further photodissociation or photoionization of the fragments ( 4 )分析结果表明二硫化碳分子的主要解离通道为:二硫化碳分子( 2 + l )咫mpi ,然后解离为碎片离子或中性碎片,解离碎片进一步解离或电离。