Now, for over 50 years, scientists believed that if they cured concrete with CO2 instead of water, it would be more durable, but they were hamstrung by Portland cement's chemistry.

现在，50 多年来，科学家们相信， 如果他们用二氧化碳而不是水来固化混凝土， 它会更耐用， 但他们被波特兰水泥的化学成分所阻碍。