Negative coefficients occur where there is a decrease in acoustic impedance across the reflecting interface.
当反射界面上下两侧的声波组抗降低时，反射系数就会出现负值。
Returns an array containing field objects reflecting all the accessible public fields of the class or interface represented by this class object.
返回一field对象数组，映射该Class对象表示的类或接口中的所有可访问公共域。
Returns an array of method objects reflecting all the methods declared by the class or interface represented by this class object.
返回一method对象数组，映射该Class对象表示的类或接口中声明的所有方法。
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