Chen Duxiu said that only Mr. Democracy and Mr. Science could save China.
Tips
history
德 is the first syllable of 德谟克拉西, an early transliteration of 'democracy', just as 赛先生 comes from 'science'. In 1919 陈独秀 wrote in 《新青年》 that only these two gentlemen could cure the darkness in China's politics, morals, learning and thought.
memory
De for Democracy, Sai for Science: each gentleman is named after the first sound of the English word.