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过渡车钩设计用来牵引一列CRH380B型动车组，在回送和（）工况下可使用。

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风挡可分为（）和外风挡

Summarize the main idea of this passage in no less than 50 words and explain how what evidence is used to support the position, which you will need to identify as well.Food Security in ChinaThe people are the foundation of a country; food is the primary need of the people. As food decides national prosperity and the people's wellbeing, food security is a major prerequisite for national security. Since the founding of the People's Republic of China (PRC) in 1949, China has always prioritized food security in state governance. Despite a weak agricultural foundation and extreme poverty, the Communist Party of China (CPC) has led an unremitting campaign of hard work over the past 70 years that has made China basically self-sufficient in food supply. China now has enough food to feed its nearly 1.4 billion population, and has remarkably improved the people's nutrition and life quality. China's food security is a success of worldwide significance.Food security is an essential guarantee for world peace and development, a significant foundation for a global community of shared future, and an influential factor for the development and future of humanity. As the world's largest developing country, and a major country that shoulders its responsibilities, China has always been a positive force in safeguarding world food security. China has been an active part of global food security governance, enhancing international exchanges and cooperation, supporting the multilateral trade system, and implementing the United Nations 2030 Agenda for Sustainable Development. In this sense, China has made a positive contribution to improving global food security and promoting common development.

Translate the following statements into English.1. 民为国基，谷为民命。中国增强农业生产能力，提前实现零饥饿。2.截至2019年底，共向37个亚非国家派遣了81个农业技术专家组、808人次；在非洲国家援建22个农业技术示范中心，为有关国家试验并推广高产新品种，指导农民提高生产能力，增强发展信心。3.在老挝、巴基斯坦、埃塞俄比亚、肯尼亚、乌干达等国遭受蝗灾等自然灾害时及时援助，帮助快速恢复农业生产。

拱坝坝体既有拱作用，又有梁作用。它所承受的水平荷载一部分由________的作用传至两岸岩体，另一部分通过竖直梁的作用传到坝底基岩。