例句與造句

1. 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。
2. It's difficult to find macro-variable in a sentence. 用macro-variable造句挺難的