唯一 wéiyī HSK5 only Origin Definitions Defs Strokes Stroke Words Sentences Sents 唯一性 wéiyīxìng uniqueness 实践是检验真理的唯一标准 shíjiànshìjiǎnyànzhēnlǐdewéiyībiāozhǔn sole truth criterion Actual practice is the sole criterion for judging truth (a key principle of Deng Xiaoping theory, dating from 1978).