英语翻译随着高新技术不断发展的21世纪,现代生物技术在人们的日常生活方面已经扮演了一个极为重要的角色.其中下游加工技术正

英语翻译
随着高新技术不断发展的21世纪,现代生物技术在人们的日常生活方面已经扮演了一个极为重要的角色.其中下游加工技术正是将生产转化为实际的关键.因此下游加工前景极为广阔.故而我们应该首先了解下游加工在生活中的各种用途,然后再结合实际进行研究.下游过程也称生物分离过程（bioseparation）,是生物工程的一个组成部分.生物化工产品通过微生物发酵过程、酶反应过程或动植物细胞大量培养获得,从上述发酵液、反应液或培养液中分离精制有关产品的过程即为下游加工过程（Downstream Processing）.传统上由一些化学工程的单元操作组成,但由于生物物质的特性,有其特殊要求,且其中的某些单元操作在一般化学工业中应用较少,所以近年来其研究领域越发接近生物工程方向.下游加工过程的生物产品,由于氧传递限制、细胞量和产物抑制,往往是产物浓度低的水溶液.其组分复杂,含大分子、小分子、可溶物、不可溶物和化学添加物等；产物稳定性差,易发生化学降解和微生物降解；由于培养过程分批操作导致生物变异性大.然而生物工程成品主要面向药品和食品,所以其质量要求较一般化学工程产品高.这篇文章全面介绍了下游加工技术在人们生活中发挥的作用和其所扮演的角色,同时还指出了其会为人类社会带来的困难问题和光明的未来.

Modern biotechnology has been playing a vital role in human daily life, as high and new technology develops in 21st century. It is the key point of its Downstream Processing technology to convert production into practice. Therefore, the Downstream Processing claims its prospect of a broad use, and thus we should learn about its various usages in human life and then undergo researches according to the practice. As a part of Bioengineering, Downstream Processing is also called Bioseparation. Bio-industrial products are obtained from fermentation, enzymatic reactions or/and cell culture of plants and/or animals. Downstream Processing is to separate and refine the media mentioned above to obtain the target products. This is constituted of some sets of Chemo-engineering units traditionally. However, it has been interacting with Bioengineering recently, for bio-materials have their special requirements according to their specific traits and some of the Chemo-engineering units are applied immaturely. Products of Downstream Processing are often occur in forms of dilute solutions as the restriction of oxygen transfer, inhabiting effect of mass of cells and products per se. It figures a complicated set of constituents,including macromolecules,micromolecules,soluble and insoluble substance and chemical additives. The products are liable to be degraded by chemical or microbial factors and thus lack stabilities. And the variability of it caused by the batch operation during culturing processings is huge. However, It has a higher demand of quality comparing with the products from chemo-engineering commonly, since they are mainly applied in food and medicines. This article makes an overall introduction about the role which Downstream Processing technology plays in human life, and point out the questions it brings about to human society and its promising future in the mean time.
水平有限,望见谅.另外建议修改一下原句,感觉有些句子结构稍加调适更通顺