被连续相所围绕的分散体系中的固体、液体或气体。
The scattered solid, liquid, or gas in a dispersion that is surrounded by the continuous phase.
只有当体系中两相都存在时，在液体和气体之间才有界限分明的界面。
Only when both phases are present in the system is there a clear-cut distinction between liquid and gaseous states.
气溶胶：液体或固体微粒以极细分散的状态均匀分布于整个气体(通常为空气)中形成的体系。
Aerosol: System of tiny liquid or solid particles evenly distributed in a finely divided state through a gas, usually air.
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