例句與造句

1. Special emphasis has been given to the synthesis and characterization of reactive , functionally - terminated siloxane oligomers , which are the key starting materials or intermediates in the preparation of the well defined block or segment copolymers and play an important role in these reaction systems
   反應(yīng)性矽氧烷是制備有機(jī)矽的嵌段或接枝共聚物的關(guān)鍵起始原料和反應(yīng)中間體，在共聚物的形成中起著重要的作用。
2. It's difficult to find segmented copolymer in a sentence. 用segmented copolymer造句挺難的