Science and technology are part of the productive forces.

　　科學技術是生產力。

　　Relations of production must conform to the level of productive forces.

　　生產關系必須適合生產力。

　　The industrial societies have been extremely productive during the last two centuries.

　　在過去的兩個世紀里，工業(yè)社會的生產力非常高。

　　Within the productive sector, there was a growth of a variety of specialist craftspeople.

　　在生產部門，各種專業(yè)工匠都在增多。