Thirdly, productive labour enables prisoners to acquire productive skills and knowledge which make it possible for them to earn a living when they have served their sentence. 第三,通過(guò)生產(chǎn)勞動(dòng)使罪犯盡可能地掌握一種或幾種生產(chǎn)技能及知識,可以為刑滿(mǎn)釋放后的就業(yè)謀生創(chuàng )造條件。