Science Without Borders
By Lan Xinzhen
Science and technology is among the factors that have taken the human civilization to the level it enjoys today. Every milestone in scientific and technological progress has taken society a step forward.
进一步筛选不同DPPC与甘露醇质量比（1∶1、1∶2、1∶3）的白藜芦醇DPPC脂质粉雾剂处方，通过对外观、流动性和载药量综合比较，选择甘露醇与DPPC质量比为2∶1，作为粉雾剂最优处方（图2）。
While there are no complete records of all scientific and technological innovations, among the recorded ones, the compass invented in China and the steam engine in the West are among the indisputable contributors to progress.
In the course of time, these epochal inventions have been bested and replaced by more advanced innovations. Though advanced in their times, these pioneering inventions are out of date in today’s modern times.
无人机飞防药剂要求稀释倍数只有4.5～10.66倍[6]．通过实验发现，甲维盐微乳剂在稀释倍数为5倍时，其乳化性能合格，与低含量制剂相比减少了溶剂和助剂的用量，从而使生产成本明显降低，因而具有较高的经济效益和推广应用价值，适合作为飞防专用药．
Therefore, technicians and scientists ought to give full play to their innovations during the latter’s limited “shelf life.” However, the application and spread of advanced science and technology has been hitting man-made snags in today’s world. Many of these blocks are imposed by the developed West.
杜一朵是窖藏的酒，窖藏并不等于密封。美丽女人杜一朵散发着成熟女人独特的芬芳，浓烈的气息从细密的毛孔透出，时刻招引着雄性的蜂蝶。酒的苦处是没有找到品鉴的人，酒的落寞，只有懂酒的人知晓。
Numerous scientific innovations that enjoyed their heyday in history were later replaced by new ones. Today, although we still admire those inventors,we are not awe-struck by their innovations or inventions as we now boast of science and technology much more sophisticated than in the past.
Both China and the United States are frontrunners in 5G technology. U.S. telecom companies and consumers have a huge demand for Huawei’s 5G equipment but have been blocked access because of U.S. politicians’ focus on their own interests.
However, 5G is not the end of communication technology. In the near future, quite possibly, it will be replaced by quantum communication technology.The space station technology of today will also be replaced by new ones. One day in future, human beings may be able to undertake interplanetary journeys as easily as they travel by plane from one country to another. Focusing on immediate interests and turning a blind eye to the future will hamper science workers’efforts to maximize the benefits of science and technology and will also affect entire society.
The 5G communication technology, or 5G,is currently the most advanced in the world.Communication technology has been advancing by leaps and bounds. It took less than 10 years to develop 3G from 2G and then just three years to leap to 4G. Now communication technology has entered the 5G era, which will help further develop the Internet of Things and artificial intelligence.
Instead of shutting its doors to other countries, China has been seeking to share its sci-tech achievements through international communication and cooperation
The International Space Station, a manned space laboratory that saw the first launch in 1998,will complete its mission in 2020 and then go out of orbit, falling into the sea. By then, China will have established its own space station, which will be the only one of its kind in space at that time. China has expressed its willingness to share the space station with the rest of the world. But if U.S. politicians continue with their obstruction, it will be impossible for U.S.aerospace workers to use the Chinese space station.
For instance, while China has made remarkable achievements in aeronautical technologies, making some aerospace workers in the United States desirous to cooperate with their Chinese colleagues,American politicians have been preventing it.
Will the science and technology of our times endure forever? Certainly not. In the future, people will view today’s science and technology just as we treat those of centuries ago.
Science and technology is a wealth that belongs to all mankind. To prevent its spread and exchange of scientific data for the sake of narrow interests is a selfish act.
先秦“气”论演变及对《黄帝内经》的影响……………………………………………………………………腊永红，张丽娟（2.40）
The world needs a consensus to maximize the benefits of science and technology, condemn efforts to impose borders on science, and seek to remove restraints on communication.
Under the Western world’s blockade of science and technology in the past decades, China adopted a policy of independent innovation and today, has taken the lead in many areas. But instead of shutting its doors to other countries, China has been seeking to share its sci-tech achievements through international communication and cooperation.
At a time when science and technology is moving forward with giant strides, those who try to restrain communication and sharing the progress will only succeed in making laughing stocks of themselves.
微课的运用应当穿插在数学教学的不同阶段。在课前，教师可以在微课平台上上传相关的课件、视频等教学资料，学生可以根据自身情况，借助微课平台，利用相关课件资料完成课前预习，对即将学习的知识进行初步了解；在实际数学课堂上，教师则可以根据学生课前预习的完成情况，因材施教，设计该堂课程的具体内容，以微课的形式对重难点知识进行讲解，从而使学生对该部分知识能够更好地消化，以此提高教学效果；课后，教师可以将课后作业发布在微课平台，学生可以通过练习总结进行自我反思，从而巩固知识。
Copyedited by Sudeshna Sarkar
Comments to lanxinzhen@bjreview.com
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