vegetation variability的用法和樣例：
例句
- Groundwater is an important affecting factor for vegetation variation.
地下水是影響植被變化的主要因素。 - The study on the morphology of stomata of conifers is the foundation of identifying fossil stomata that is important for the study of the change of vegetation and climate.
摘要現代針葉樹(shù)氣孔器的研究為鑒定化石氣孔器奠定了基礎，對第四紀植被變化和古氣候的研究起著(zhù)很重要的作用，是第四紀孢粉學(xué)的一個(gè)重要補充。
