In harmonicapproximation, the specific heat obeys T3 law at low temperature, keeps a constant at high temperature.
在谐和近似下，低温比热符合T3定律，高温比热趋于常数。
2
This paper gives and analyses a general expression of the dispersion relation of one-dimensional lattice waves in simple harmonicapproximation.
给出了在简谐近似下，一维格波色散关系的一般表达式，并对其结果进行了分析。
3
The angles will never be very large, as you will see later when we calculate theta maximum, and so we know that we're going to get a simple harmonic oscillation to a very good approximation.