谁能帮我翻译一下这两句

Many present-day cements that would be considered normal today would have been described as rapid hardening only a few decades ago.
今天很多被认为是常规的混凝土可能在仅仅几十年前会被认为凝固过快。
Cerments are a class of materials containing both ceramics and metal ;these materials were developed in an attempt to combine the best properties of both types of materials
混凝土是一类含有瓷土和金属的材料，这些材料都是为了达到这两种材料性质的最佳结合而开发的。