发酵是影响普洱茶品质成分变化的主要原因。
Fermentation was the main influence factor of Pu 'er tea quality.
泉水化学成分变化研究一直是国内外学者研究的热点问题之一。
At home and abroad, research on chemical composition of springs water is one of the hot problems.
根据垃圾性质、垃圾储存时间、气候等因素，渗透液的成分变化很大。
The character of leachate will change depends on the character of refuse, duration of storage and weather etc.
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