我讲的第八部分是关于现状和前景（present situation and prospects）。后教法时代并不等于没有法，英语“四位一体”教学法吸收了国内外很多先进的教学理念。
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介绍了国内外醋酸乙烯供需现状和市场前景，提出了关于醋酸乙烯装置建设的几点思考。
The article introduces supply & demand status and market prospect of vinyl acetate both home and abroad and puts forward several considerations about its unit construction.
本文综述了瓜氨酸的药理作用及目前国内外关于瓜氨酸的应用和研究现状，并对其发展前景进行了展望。
The pharmacological effects, the application and research current situation about citrulline were summarized in home and abroad. The development prospects of citrulline were predicted.
本文综述了国内外关于利用沼气发酵外源添加物以提高沼气产量的研究现状，并对其应用和研究前景作了展望。
A review is made in this paper on enhancing the biogas production by using various additives in anaerobic digestion, and the prospects in this field are discussed.
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