以降

yā piàn zhàn zhēng yǐ jiàng zhōng guó zhú bù lún wéi bàn zhí mín dì bàn fēng jiàn guó jiā

鸦片战争以降，中国逐步沦为半殖民地半封建国家。

Since the Opium War, China has gradually become a semi colonial and semi feudal country.