“硬性”怎么读

这些课不是硬性规定要听的。Attendance at these lectures is not compulsory.参加晚祷并非硬性规定.Attendance at evening prayers is not compulsory.高水材料是一种新型水硬性无机胶凝材料,水灰比高达3.0.The material with high water is a new water - hardening inorganic gelling...

“硬性”的英语可以翻译为：hardness，rigid，stiff，inflexible ...