In any profession—business, politics, education, government—those in power should step down after five years. The surest path to success for any enterprise is revitalization through new leadership.

　　在任何领域中——商业、政治、教育、政府——掌权者应该在五年后就让位。这是任何机构获得成功的最好的方式：通过更新领导者而保持活力。

　　正文：

　　The speaker asserts that the surest path to success for any enterprise is revitalization through new leadership and the leader who is in power should step down after five years. I agree with this assertion insofar as new leadership is needed in order to maintain strength and energy in some areas, such as politics and business. When it comes to education and science, however, I think both new energy and experiences are crucial to that enterprise.

　　To begin with, I want to discuss the reason for the speaker to make such an assertion.I think two main reasons can contribute to this assertion. First, a leader might easily be left behind by the ever-increasing advanced technology and advanced management methods after several years in power. Especially for those leaders who are elected to position in their old age. Second, when a leader has hold power for a long period of time, it is more possible about the risk that he would use his power to do some individual things and make benefits for himself. To prevent these two defects, the speaker asserts that through new leadership we can surest path to success.

　　In some areas, such as politics and business, in my view, new leadership after several years of one leader is needed and vital to a country and a business. Because these enterprises need new idea to be survive and thrive. And it is more important to prevent about the second risk that leader would use his power in some individual desire. In politics, for example, some countries are under the control of a king who would in power until his death. History informs us that the king would become luxurious and consider nothing about his country after several years in power, especially in his old time. Nowadays, most countries have abandoned the monarch system and adopted the system of election, in which leader should be reelected after 4 or 5 years. Also in business, the Chief Executive Officer (CEO) of a company should be reelected after his execution for several years in order to maintain the company's energy. Admittedly, to reelect does not mean the younger will sure substitute the elder but to provide a fair competition environment, in which the best leader can be elected to make benefit to that enterprise. To reelect can also inspire the motivation of the old leader and prevent the risk of egotism.

　　On the other hand, in education and science, in which experiences are more crucial,there is no need to change leader after years. In such areas, more experiences and knowledge are requisite in order to make directions and strategies more effectively and efficiently. For example, in every country there is a scientific institution, and almost every academician of it is over 50 years old, not to mention the leader of the institution. In science, admittedly, originality and challenging to old knowledge are the stepping stone to the progress of science. However, due to today's complex and deep knowledge system, if one can not hold the whole system of scientific knowledge and can grasp the clear direction correctly, leadership would not appropriate to him. This is just like a skyscraper which stands for the amount of knowledge today, and which should have strong foundation to endure the rain and wind in future. Also in education,we always say we can get more from the elder. Only elder can give us more experience of life and perspective of questions which is more crucial in education for the purpose of make out true individual. Yet, these do not mean a leader can keep in power for ever, in some cases, especially when the leader lose his energy and can not keep in pace with the development, we should reelect other leader to substitute him.

　　In sum, we can not say a leader should leave his position after 5 years in power in general. The answer to this question depends on different areas and cases. In the areas that need more newly ideas and prevention of the risk of abuse of power, such as politics and business, I agree that leadership should be reelected after several years. While in other areas that experience is more crucial to the enterprise, we should decide whether to reelect or continue the leadership with different cases.