主题词:Elementary Particle Theory and Field Theory,Canonical Quantization,S-Matrix,Gell-Mann-Nishijima formula,Renormalisation Theory,Renormalisation Group,Gauge Field Theory,Gauge conditions,Weinberg-Salam Model,Non-Abelian Gauge Fields,Becchi-Rouet-Stora Transformations,BRST Symmetry,Path-Integral Method