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二 | While scientists and science fiction authors alike have long dreamed of sending crewed missions to Mars, a new study suggests these plans may hit a snag – a big one.,The authors of a yet to be peer-reviewed study argue that the participants of such a mission to Mars would end up being exposed to radiation – namely, to “energetic charged particles from Galactic and Solar origin” – both while in transit and while on the planet itself, with the “thin spacecraft shield” and “rarefied Martian atmosphere” offering little in the way of protection.,The research team attempted to gauge the impact of a simulated 1,000-day mission to Mars on various organs of the human body, and concluded that astronauts may be exposed to radiation doses above one Sievert, which is over the safe limit set by most space agencies, New Scientist points out.,“We suggest mitigation strategies such as improved ways of shielding and dietary supplements, and make recommendations for the safety of astronauts in future crewed missions to Mars,” the team wrote in the abstract of their work available on the arXiv preprint server.,Ideas about how astronauts may be protected from radiation during a mission to Mars have already been proposed, such as the concept of a radiation shield comprised of a fungus found growing at the Chernobyl Nuclear Power Plant.,Last year, one architecture studio even unveiled a project for a self-sufficient and sustainable city that would be built on the red planet itself.。姑娘们在一球落后的情况下，展现出十足的血性和韧性，这是“铿锵玫瑰”的光荣传统，但一场苦战也为中国女足敲响了警钟。韩国队近年来的快速提升，正对应了世界女足竞争格局的激变，中国女足想从中占据一席之地，需在实力经验的磨砺和后备力量的培养方面下更多功夫。中国女足近十年来经历起伏，从时隔十年再胜美国队，到时隔八年重返奥运会赛场，姑娘们一步一个脚印走上复兴之路。
三 | 2016年，中国女足曾力压日本队而进军里约奥运会，1/4决赛因射失点球以一球不敌当届冠军德国队。
四 | 但在去年的东京奥运会赛场，中国女足却遭遇溃败。如今再度面对韩国队，已经失去了对韩国队的实力压制，证明中国女足已落后于世界女足的发展速度。
五 | 在此前青岛集训期间，中国女足在训练之余，也十分关注正在激战的欧洲女足锦标赛。王珊珊曾感叹说，欧洲女足趋于男性化的战术风格，令其倍感压力。在她看来，中国女足挑战欧洲劲旅的前提，首先要在亚洲赛场证明自我。但与韩国队遭遇的苦战，也告诉中国女足，在明年的世界杯女足赛打响前，仍有诸多功课要做。按照赛程，中国女足将在7月26日与东道主日本队争夺本届东亚足球锦标赛女足赛事冠军，考虑到姑娘们此番东征以练兵为主，主帅水庆霞更重视比赛过程。目前看来，中国女足所面临的难题，主要集中在推进新老交替和缺少实战练兵两方面。从欧洲女足和韩国队近年来的快速提升也能看出，中国女足后备力量的培养以及国家队和各级梯队的体系建设，同样有进一步完善和精进的空间，以顺应世界女足的发展趋势。
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