This shows that the heart beat signal of fetal is not signal of noise, not periodic signal, but the signal, which may follow some dynamical laws.
这说明胎儿心率信号不是噪声，不是周期信号，可能是服从一定动力学规律的信号。
2
The discovery of Kepler three laws and the periodic table of chemical elements as well as the establishment of the quantum theory of hydrogen atom are typical examples.