目前，国内外对林地外部效应评估的研究十分缺乏。
It was very lack to research external effect of woodland appraisement at the moment.
本文包含微波生物医学成像和雷电电磁效应评估两方面的研究内容。
The research contents of this thesis include two parts: microwave biomedical imaging and evaluation of lightning electromagnetic effects.
随着社会就业压力的增大，旅游业的就业效应越来越受到重视，关于就业效应评估的研究逐渐增多。
As the increase of social employment pressure, the employment effects of tourism are getting more and more attention and researches on evaluation of employment effect also increase gradually.
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