31 在威尔逊云室、胶片上粒子迹线中断是否表示那里发生了"质湮"？

答 不，因为达到一定条件的粒子才形成迹线，上述现象只是“迹湮”，说明该粒子行进途中发生衰减，从能显示转变为不显示（见《L06 夸克》文）。

31.wether it happened “quality stop” while the trace suspend in Wilson cloud chamber、on the film?

Answer：no, because of when the particle reach to controlled condition can form trace only, above phenomenon is “trace stop” only, it explain this particle happen attenuation when in the process way, from can show translate to cannot show (see also in 《L06 Quark》) 

L06文）。