1. There is a period of gestation of ideas before writing, like the period of gestation of an embryo in its mother's womb before birth. 一个人的观念在写作之前，都有一个怀孕时期，也像胚胎在母腹中必有一个怀孕时期一般。
2. Any product has a life circle. There are leading period, growing period , maturation period and declining period. Different period has different marketing strategy. 在导入期，我们有四种营销策略可以选择：快速掠夺，缓慢掠夺，快速渗透和缓慢渗透。
3. Daqu culture process is divided into five stages of fermentation prior period, temperature rise period, high temperature period, temperature drop period and maturation period. 大曲培养过程分为发酵前期、升温期、高温期、降温期、成熟期5个阶段。
4. The structure evolution process experienced 4 stages: intensively faulting period, the period transformed from fault depression to sag, depression period and compaction fold period. 该区的构造演化经历了强烈断陷期、断坳转换期、坳陷期和挤压褶皱期4个演化阶段。
5. The evolution process of landslide could be divided into 4 periods: beginning and accelerating period, quick-moving period, braking period and tamping period. 计算结果表明，根据位移和速度的变化，可把整个滑动过程分为4个阶段：即启动加速阶段、高速运动阶段、碰撞减速阶段和缓动夯实阶段；
