演化周期 meaning in English
cyclic evolution
Examples
- It has been detailedly studied about three - dimensional shape and internal structure of deposital system in the continental basin . but lacking of high - resolutional study on confirming age according to the genetic unit , and also lacking of quantificationally study on evolutive periodicity and velocity of deposital system and its internal structural unit
在陆相油田沉积学研究中，人们对陆相油田地下沉积体系的三维形态描述和内部构成特征的研究已较为深入，而缺乏对以成因相为单元进行高精度定年研究，更缺乏对沉积体系及内部构成单元演化周期及演化速率的定量研究。 - ( 2 ) the analysis by characteristic section planes can draw that the ancient climate in deposit period of the characteristic section plane one sediments ( about seventeen thousand years before present ) is warm - dry and has relative humid and dry evolution rule , from fifteen to thirty years as its evolution period , that the ancient climate in deposit period of the characteristic section plane two sediments ( about fourteen thousand years before present ) is humid and has relative alternate very humid and humid evolution rule , from two to fourteen years as its evolution rule
( 2 )通过对两个典型剖面的综合分析得出，典型剖面沉积物沉积时期(距今约17kab . p . )的古气候特征总体上为暖干，并具有以15 30年为演化周期，相对的湿润-干燥-湿润的演变规律。典型剖面沉积物沉积时期(距今约14kab . p . )的古气候总体特征为湿润，并具有以2 14年为演变周期，相对的很湿润-湿润交替的演化规律。