“变硬的”的英语可以翻译为：hardened，indurative ...

这些矿物质形成了菌斑的结晶变硬的结构.These minerals form crystals and harden the plaque structure.变硬的熔岩块象雨点般降落在山下村庄.Boulders of hardening lava can rain down on villages.同样不幸的是, 挖出变硬的盐是唯一的解决方法.Unfortunately again, digging the hard salt out...