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.
文章将危机传播控制划分为前期危机预警、中期危机处理和后期危机调控三个阶段，并提出了一套危机传播控制的基本模型。
The paper divides the crisis spread and control into three phases: crisis prewarning, middle period and crisis handling period.
嵌入式调制解调器的开发，可以分为三大部分：前期分析、中期设计和后期测试。
The research and development of embed modem is composed by three parts:the prophase analyse, the middle design, the anaphase testing.
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