运用地层中植硅体组合解释过去草原植被及气候变化的关键之一，是要了解研究区现代植硅体形态及表土植硅体组合与现代植被的关系。
The use of modern phytolith assemblages for the interpretation of fossil phytoliths shows phytolith analysis is an effective method for understanding the grassland vegetation and climate changes.
更重要的是，随着现代城市的快速增长植被已大大减少了。
What is more, vegetation had been greatly reduced with the rapid growth of modern cities.
更有甚者，随着现代社会的迅速扩建，植被大大的减少。
What is more, vegetation had been greatly reduced with the rapid growth of modern cities.
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