lì shǐ / shàng / xǔ duō / yì yì zhě / dōu / céng / wèi / zhēng qǔ / yán lùn / zì yóu / zuò chū / guò / gòng xiàn

历史上许多异议者都曾为争取言论自由做出过贡献。

Many dissidents in history have contributed to the fight for freedom of speech.