[[Image:vacuum polarization.svg|thumb|(a) Vacuum polarization, a.k.a.电荷屏蔽。这个环有一个对数的紫外辐散。|链接=Special:FilePath/Vacuum_polarization.svg]] | [[Image:vacuum polarization.svg|thumb|(a) Vacuum polarization, a.k.a.电荷屏蔽。这个环有一个对数的紫外辐散。|链接=Special:FilePath/Vacuum_polarization.svg]] |