[填空题]
Symmetry breaking occurs in the8 ;efo lcuwtwt,2r) 2u electroweak th4s) dz,f5lvl zz 7gop-eory at about $10^{-18}\ \text{m}$. Show that this corresponds to an energy that is on the order of the mass of the W boson ($M_W c^2 \approx 80\ \text{GeV}$). $mc^2$$\approx$ GeV
