If you were paying attention, you learned that alcohols are organic compounds with hydroxyl groups, if you dehydrogenate them, the hydroxyl converts to a carbonyl and they become dehydrogenated alcohols or aldehydes.

如话，就会知道醇是带有羟基有机化合物， 如它们脱氢， 羟基就会转化为羰基， 它们就会变成脱氢醇或醛。