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然后，本文分别展开对新生代前期和后期的分析。

Then, launches separately to Cenozoic Era earlier period and later period's analysis.

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同时，在监察内容方面前期和后期也呈现出截然不同的样子。

Besides, as to the supervisory itself, there were striking differences in terms of supervisory objectives between the early period and the late period of the Tang Dynasty.

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结果表明，地膜覆盖在玉米生育中期保水效果明显，而在生育前期和后期保水效果不明显；

The results showed that the film covering had obvious effect on soil water conservation at the middle stage of corn growth, but neither at the earlier, nor later stage was obvious.