但以中国这么大的人口总数，在经过较长时期过后，生育率的微小差别也会产生深远的影响。
But with a population as large as China's and over a long time horizon, the consequences of small differences in the fertility rate are far reaching.
另外，研究结果表明组成光子晶体的两种材料的折射率差别越大，两种电磁模的禁带越宽，越容易产生完全光子禁带。
The results of study also shown that the biger difference of refractivity between two kinds of materials, the wider of the bandgap for two electromagnetic modes, and easier to produce full bandgap.
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