primary productivity短语¹³¹⁶²⁰⁺³ 基本例句 初级生产力,第一性生产力 It was still the results of the period of primary productivity. 但是，它毕竟是生产力低下时期的产物。 cnki This is asked as a means to determine the land productive potential from the annual primary productivity a parcel of land can support. 因此，我们可以在类似环境下用这种方法估测土地生产潜力。 dictall