单词	First think
释义	First think 先思而后言。
随便看	Particle Filtering Algorithm particle filtering theory Particle filters particle filters optimize particle fineness particle fining particle flame particle flocculation particle flow particle flow code particle flow codes particle flow discrete element particle flow method particle flow rate particle flow theory particle fluence particle fluence rate particle fluence rate indicator particle fluence ratemeter particle fluence rate monitor particle-fluid system particle fluorimetry particle flux particle flux density particle flux density indicator