404. That’s an error.

The requested URL /translate_c?depth=1&rurl=translate.google.com&sl=en&sp=nmt4&tl=pl&u=https://en.wikipedia.org/wiki/Coefficient_of_thermal_expansion&xid=17259,15700023,15700124,15700149,15700186,15700191,15700201,15700237&usg=ALkJrhiK4aYnz1WaNMv8PJvr2_YPQ86wkg was not found on this server. That’s all we know.