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Hace 23 horas · One Direction《Best Song Ever》TOYOTA Concert Series20141117. 【说明】来源标注为“网络”的，表示该视频来自其他网站；标注为“自录”或频道名称 (例如湖南卫视)的，表示该视频由本up主自己录制。. 网络, 视频播放量 1、弹幕量 0、点赞数 0、投硬币枚数 0、收藏人数 0 ...
Hace 23 horas · Origin of the name Eric Foner wrote that the term "was perhaps first used by a Washington newspaper in 1839, quoting a young slave hoping to escape bondage via a railroad that 'went underground all the way to Boston'". Dr. Robert Clemens Smedley wrote that following slave catchers' failed searches and lost traces of fugitives as far north as Columbia, Pennsylvania, they declared in ...
Hace 23 horas · The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe.It is a remnant that provides an important source of data on the primordial universe. With a standard optical telescope, the background space between stars and galaxies is almost completely dark.However, a sufficiently sensitive radio telescope detects a faint background glow ...
