So there are both continuous and discrete in the progress ( id fact , we always meet such a progress with both continuous and discrete variation during studying the biological model ) . then we can model the progress by a dynamic equation on tune scales to solve it easily . since the last decade , there have been much advance on the dynamic equations on time scales 那么这个过程既有连续的又有离散的(事实上,在描述生物种群状态的生物模型中我们经常会遇到象这样的一个变化过程中同时具有连续的和离散的变化) ,我们就可以用一个时间模上的动力学方程来描述,进而用时间模上的运算对此加以解决,那么问题处理起来就简单方便了。
The relations between enterprises , similar to those of living organisms , have such main characteristics as competition , symbiosis , etc . the development of the ecological relations between enterprises not only requires cooperation and competition but also concurrent evolution 二企业间相互关系如同生物种群之间的相互关系一样,具有竞争、共生等主要特征。企业间生态关系是企业与企业之间具有生物种群关系特点的相互关系,这种关系的维持和延续要求各企业不仅要竞争合作,而且还要协同进化。