例句與造句

1. Researchers at the Dow Chemical Company synthesized several fluorene-based copolymers by alternating copolymerization using 5, 5-dibromo-2, 2-bithiophene which showed yellow emission and 4, 7-dibromo-2, 1, 3-benzothiadiazole, which showed green emission.
2. It's difficult to find alternating copolymerization in a sentence. 用alternating copolymerization造句挺難的