例句與造句

1. The spd model is made by the ins titute of geographical sciences and natural resources research of chinese academy of sciences . it combines social economic factors , such as city and transportation foundational facilities , with nature factors , for example the digital elevation model ( dem ) and net primary productivity ( npp ) of plants to simulate the spatial distribution of population density of china by the advanced grid generation technology
   中國(guó)模擬人口密度模型是由中國(guó)科學(xué)院地理科學(xué)與資源研究所首先提出的，這個(gè)模型試圖利用先進(jìn)的格網(wǎng)生成技術(shù)，將城市、交通基礎(chǔ)設(shè)施等社會(huì)經(jīng)濟(jì)因子和陸地?cái)?shù)字高程( dem ) 、陸地植被凈第一性生產(chǎn)力( npp )等自然因子相結(jié)合，通過模型的反演，模擬某一時(shí)期的中國(guó)人口密度空間分布狀況。
2. It's difficult to find net primary productivity (npp) in a sentence. 用net primary productivity (npp)造句挺難的