[填空题]
Symmetry breaking occurs in8yv2zm.ei/79 cti,epghiw iez xw 73( the electroweak theory at aboutf+q ts p.-ga:d $10^{-18}\ \text{m}$. 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
