在粒子物理学中，轻子数是一个守恒的量子数，代表着一个基础粒子反应中的轻子数量减去反轻子数量（轻子数用L表示，凡是轻子，L=+1；凡是反轻子，L=-1；轻子以外的粒子，L=0）。
... Leptonic model 轻子模型 leptonic number 轻子数 leptonic weak interaction 轻子弱相互作用 ...
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我们把轻子数推广为轻子荷。
夸克不仅带有重子数、电荷，而且也带有轻子荷。
The quarks have not only baryon number and charge but also lepton charge.
营养枝数、不定根数、匍匐茎、子间距和节间距在封育区和轻牧区相互间无差异，且营养枝数和不定根数在两样区最多。
The number of the vegetative shoots and stolons and distance between the two adjacent reproductive nodes and stolons were not significant difference between light grazing and fence plot.
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