The elephant population in that area is falling. 那個地區的大象總數在下降。
The birth rate is the number of births compared to the size of the population. 出牛率是出生人數與人口總數之比。
An effective iterative algorithm for computing the closest dynamic oscillatory stability margin in full parameter space was proposed. 提出了全參數空間下的最近動態電壓振蕩型失穩邊界的計算方法。
China's population continues to grow,the proportion of the aged is getting larger,and the pressure on employment and social security is mounting. 人口總量繼續增加，老齡人口比重上升，就業和社會保障壓力增大。
The Chinese population time series models have been formulated, but the Shaanxi population time series model has not been researched into. 對全國人口總量時間序列模型，已進行了一定的研究，對陝西省人口總量時間序列模型尚未研究。
