Soon opium dens spread to large cities such as London and San Francisco.

很快，鸦片烟馆蔓延到伦敦和旧金山等大城市。

There were opium dens where one could buy oblivion, dens of horror where the memory of old sins could be destroyed by the madness of sins that were new.

那里有鸦片窝点，人们可以在那里买到遗忘，有恐怖窝点，旧罪恶的记忆可以被新罪恶的疯狂摧毁。