Caution! The site can't guarantee, that text has age permission. The site is not recommended, if you are less than 18 years old.
The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... There are a lot of unknowns in these alternative scenarios and reactor designs. Some designs operate at much higher temperatures than current reactors, and require longer service lives and high burnup for fuels. Some use fast or epithermal neutrons and use very aggressive coolants, like molten metals or molten salts. So new, sometimes exotic, materials are needed which may introduce different or greater amounts of activation products (materials made radioactive from being bombarded with neutrons during operation). ... "