写作思路：根据为科技主题，以为发展基调来展开描写，紧扣叙述与描写的内容，力求做到不突兀、不生硬，不长篇大论或肆意抒情，有情真意切之感。
范文：
It can be expected that there will be a breakthrough in life sceience and space science in the 21st century First， scientists will conquer incurable diseases through the transformation of genes
可以预见，21世纪生命科学和空间科学将取得突破性进展。首先，科学家将通过基因转化来战胜不治之症。
With the same technology they can breed new species of animals and even human life in the laboratory Most important of all， they can decelerate aging and prolong life
用同样的技术，他们可以在实验室培育出新的动物物种，甚至人类的生命。最重要的是，它们能延缓衰老，延长寿命。
Besides， permanent stations will be set up in the moon or other planets or stars so that scientists can make a thorough study of the moon and other planets or star
此外，还将在月球或其他行星或恒星上建立永久观测站，以便科学家对月球和其他行星或恒星进行深入研究。
Most probably life will be found in other stars in universe or the planets or stars suitable for the human existence will be discovered However， the scientific development will also bring about some social problems
很可能在宇宙中的其他恒星中发现生命，或者发现适合人类生存的行星或恒星。但是，科学发展也会带来一些社会问题。
How should we regard from an ethical perspective the one who is bred through the gene technology in the laboratory
我们应该如何从伦理的角度看待实验室里通过基因技术培育出来的人。
How can the police identify the criminal from a group of people with the same DNA？ It is quite natural that we will meet problems in the scientific and social development Therefore， we should be prepared to meet new challenges
警察怎么能从一群DNA相同的人中认出罪犯？我们在科学和社会发展中遇到问题是很自然的。因此，我们应该准备迎接新的挑战。