The discovery of surplus value suddenly threw light on the problem, in trying to solve which all previous investigations, of both bourgeois economists and socialist critics, had been groping in the dark.

• 这一发现使得资产阶级经济学家和社会主义批评家对他们试图解决的问题的认识豁然开朗；而在此之前，他们只能在黑暗中摸索。