1、It is a rule that the state of matter changes when the temperature changes.
這是一個規(guī)律，物質的形態(tài)隨溫度的變化而變化。

2、Changes of state of matter are due to increased motion of molecules.
物質狀態(tài)的變化是由于分子運動增大的緣故。

3、Air is the gaseous state of matter whose characteristic is mobility.
空氣是氣態(tài)物質其特點是流動性。