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The solar system is a hostile place. Earth is under attack from deadly cosmic radiation. Life here is only possible, because it's protected by the magnetosphere, an invisible force field that cocoons the planet. But new evidence reveals that this vit
自然百科2011年
It's clear from the fact that the Martian crust is strongly magnetized, that there must have been a magnetic field on Mars in the past, that the only way we know to magnetize rocks is for them to form in the presence of magnetic field. Why did Mars l
自然百科2011年
Russia says it wants legal guarantees from the United States that a proposed missile defense shield for Europe will not threaten Russian security. Deputy Foreign Minister Sergei Ryabkov said Monday that Moscow has been disappointed by Washington's re
英语新闻
A man of the state of Chu had a spear and a shield for sale．Hew as loud in praises of his shield．My shield is so strong that nothing can pierce it through． He also sang praises of his spear．My spear is so sharp that it can pierce through anyt
趣味英语
Like Mercury, the earth takes a beating from the sun's violent temper. Flares, sun storms and other solar hissy fits can cause electronic mayhem for the satellites that roam above our heads. Fortunately, the earth is protected from this radiation by
自然百科2012年
英国冷艳新女声：Clare Maguire - The Shield And The Sword Clare Maguire，英国新女声，也是2011年度英国最有前途新人评选第五名，今年2月她发行了首张个人专辑。Clare的声音有种冷艳的特质在里面，非常
经典英文歌曲