Sentence examples of "крепкий орешек" in Russian with translation "tough nut"
Действительно, в отличие от ядерного деления, которое прошло от лаборатории к электросетям в течение двух десятилетий, ядерный "фьюжн" оказался крепким орешком для исследователей.
Indeed, unlike nuclear fission, which went from the laboratory to the power grid within two decades, fusion has proved a tough nut to crack.
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