Solid, liquid and gas are the three state of matter. 固体,液体和气体是物质的三种状态。
Pressure, temperature and composition play as three dominate parameters to determine the state of substance. The change of temperature and composition is the usual method for studying the property of matter and for the improvement. 压强、温度和成分是物质存在的三个基本状态参数,改变温度或物质的成分是研究物质性质及改善其性能的常用手段。