As any processor has a fixed set of registers, there is a limit to the number of variables that can be kept in registers at any one point in the program.
寄存器的数量在每个处理器当中都是固定的，所以在程序的某个特定的位置，可以保存在寄存器中的变量的数量是有限制的。
We point out that the equation can be approximated by a set of linear ones and the exciton polarization wave can be regarded as a Bose field only in the limit of low excitation.
我们指出只有在激发比较弱时，这组方程才可近似为一组线性方程，电子空穴极化波才可以看作玻色场。
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