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单词 nucleation
释义 nu·cle·a·tion
\ˌn(y)üklēˈāshən\ noun
(-s)
: the process of nucleating or clustering
 < the nucleation of communities in villages and cities — A.J.Bruwer >
as
 a. : the formation of nuclei (as in a supersaturated vapor or the free air)
  < kept a continuous record of atmospheric nucleation for several years — Science >
 b. : the action of a nucleus in starting a process (as condensation, crystallization, or precipitation)
  < pearlitic structure … is formed by a process of nucleation and growth — Frederick Seitz >
 c. : the process of seeding a cloud for the production of rain
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