对绿茶制造中颜色的变化研究表明，在制造工序中，茶汤颜色不断加深， 水溶性色素种类增加。
Analysis of the pigments extracted from the tea dhool indicated that the soluble pigments of the brew of green tea increased and its colour got darker in the manufacturing process.
提升效率和增加食物种类。
某些种类的北极鸟受到近来雪雁数量急剧增加的威胁，这些雪雁在北极繁殖，并且正在取代生命力较弱的鸟类。
Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.
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