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...
He was always in the middle of a business transaction.他总是忙着做生意。He was twenty dollars in pocket by the transaction.他在这笔生意中赚了20美元.Buying a house is an important transaction for most people.买房子对大多数人来讲都是件重要的事....