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When Summer Returns_我的网站

一 | The Thalasseus bernsteini (Chinese crested tern), known as the "mythical bird," is one of the world's rarest seabirds. Since 2013, Zhejiang has been carrying out efforts to attract the species to suitable habitats and restore its population through artificial measures. After more than a decade of sustained efforts, the number of adult Thalasseus bernsteini in Zhejiang now accounts for more than 85 percent of the global population. Zhejiang is making every effort to build itself into a province with a higher level of ecological development. The conservation of the "mythical bird" is a prime example. Biodiversity conservation is not only a key focus in Zhejiang's pursuit of higher-quality ecological development, but has also gradually become a new calling card for the province's green development on the international stage. When Summer Returns, jointly produced by Zhejiang Provincial Center for Environmental Education and Communication and the China News Service Zhejiang Branch, was released online today. The documentary takes viewers to the islands to hear the stories behind the conservation of the "mythical bird."
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二 | 据了解,长七A火箭是我国新一代中型运载火箭的主力构型,是在长征七号运载火箭和长征三号甲系列运载火箭三子级基础上、通过组合化设计形成的高轨三级液体捆绑式运载火箭,地球同步转移轨道运载能力不低于7吨,填补了我国运载火箭地球同步转移轨道5.5至7吨运载能力的空白,可适配直径4.2米和3.7米两种整流罩,具备一箭一星和一箭双主星发射能力。

三 | 长七A火箭主任设计师魏远明在接受媒体采访时介绍,执行本次发射任务的长七A遥五火箭,采用4.2米直径整流罩的构型,全箭高度60.1米,与2021年3月12日发射的遥二火箭高度一致。长七A火箭作为我国首型采用助推器与芯一级集束式分离技术的捆绑火箭,相比通常先分离助推器、再分离芯一级的方式,减少了一次分离环节,使火箭捆绑连杆结构更加简化。同时,集束式分离也减少了一个助推器落区,整个组合体都在一个落区内,更加有利于控制火箭残骸落区。此次任务是长七A火箭第四次执行发射任务,火箭状态正在逐步固化,同时为进入高密度发射阶段提前准备。魏远明介绍,型号队伍针对火箭技术设计进行了多项优化改进,在确保测试覆盖性的前提下,通过优化流程顺序、并行工作、合并测试等方法,将发射技术流程由32天缩减至26天。不仅如此,根据高轨卫星整体发展态势,以及高轨卫星配置大尺寸天线的迫切需求,长七A火箭未来还将研制5.2米整流罩的新构型,进一步提高火箭的任务适应性。
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