variable adj. 1.易變的,變化無常的,無定的 (opp. constant, steady)。 2.可變的,能變的;變換的。 3.【數學】變量的;【天文學】變光的;【生物學】變異的。 Prices are variable according to the exchanges. 物價跟著匯率變動。 a man of variable character 反復無常的人。 a rod of variable length (伸縮)如意棒。 a word of variable construction 可以作種種解釋的詞。 variable capital 可變資本。 a variable budget 臨時預算。 n. 1.易變的東西。 2.【數學】變量,變數,變項,變元 (opp. constant);【天文學】變星 (=variable star);【航海】(方向不定的)變風,不定風 (opp. trade wind); 〔pl.〕 (貿易風帶中的)變風帶。 adv. -ably ,-ness n.
Thereupon , in the 3rd chapter , the characteristics of the ecological systems are discussed and the necessity of aggregation is proposed , then , the method of choosing macro - variables is discussed , and the aggregation method for the systems of ordinary differential equation is proposed . in the 4th and 5th two examples : the model of single population and the model of two populations in different environment are discussed , the method which have proposed in 3rd chapter is implemented in the two examples 同時在第四章和第五章中分別介紹生態系統中的兩種情況:單物種的發展模型和兩物種在不同環境中競爭的模型,分別介紹了對這兩種模型建立過程,并且應用第3章中介紹的方法對上述兩種模型進行聚合。然后,對聚合后的聚合模型進行分析,得到聚合模型的穩定狀態。