changing composition meaning in English

大气成分的变化

You may well ask how that is possible . tourmalines are mixed crystals of aluminium boron silicate with a complex and changing composition . it s a rather complex mineral group
是极为复杂的硼铝硅酸盐，其中可含一种或数种以下成分：镁钠锂铁钾或其他金属。
In order to understand this variety of colour , you will have to brush up your knowledge of gemmology a little : tourmalines are mixed crystals of aluminium boron silicate with a complex and changing composition
是极为复杂的硼铝硅酸盐，其中可含一种或数种以下成分：镁钠锂铁钾或其他金属。
The bank said a rebound in investment in early 2005 raised concern among analysts , but the trend remains one of a slowdown , and the changing composition should give some comfort to policy makers that the policies introduced in 2004 are working . moreover , the number of new projects declined in january - february , with a 6 . 6 percent fall in new investment volume
神野客车高度重视农村客运市场，公司将投放更多的技术力量和经理在新产品的研发上，公司在现有车型的基础上，不断丰富城乡客车产品系列进而形成一个梯队，提供更多的可选性以满足不同地区农村客运的要求。