In mathematics, we can also find periodic phenomena. For example, we often encounter circular decimals, and the numbers after the decimal point will appear repeatedly. For example, 1/6=0. 16666 ..., and 6 in this series is the number of periods.
In addition, in the cyclical phenomenon of the four seasons, we can find that each season has its specific temperature, weather and plant growth characteristics. These characteristics are repeated every season, so we can say that the four seasons are a cyclical phenomenon.
In the fourth grade cycle problem, some simple regularity problems are usually involved, such as finding out the regularity by observing the arrangement order of a group of things, or finding out the cycle pattern in a series by calculation. The solutions to these problems usually include observation, induction and deduction.
Periodic sentence making:
1 and the periodic transformation of the four seasons are the result of the earth's rotation and revolution.
There are many biological clocks in the human body, which control our sleep and wake-up cycles.
The moon's profit and loss is a cyclical phenomenon, which happens once every new moon.
4. The fluctuation cycle of stock market reflects the cycle of supply and demand.
The rotation and revolution of the earth have their own cycles, which affect our life and weather.
6. Rhythm and melody in music have their own cycles and changing rules.
7, biological reproduction and growth follow a certain life cycle.
8. The schedule of sports competitions usually has a fixed cycle, such as once a year or once every two years.
9. The congestion and smoothness of urban traffic also show a certain periodicity.
10, climate change is also affected by the earth's rotation and period of revolution.
1 1. In agricultural production, the growth cycle and harvest season of crops have certain laws.
12, you need to study according to the cycle of the curriculum, and you can't disturb the plan at will.
13, the economic cycle is an inevitable fluctuation phenomenon in the process of economic development.
14, species succession is a long life process, its cycle is thousands of years or even longer.
15, women's menstrual cycle affects their physiological and psychological state.