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union alloc_header{
。关于这个话题，爱思助手下载最新版本提供了深入分析
（一）明知住宿人员违反规定将危险物质带入住宿区域，不予制止的；
缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）
Aurora lights shimmering over Earth were filmed on camera by Russia's space agency Roscosmos cosmonaut Sergey Kud-Sverchkov from the International Space Station. The phenomenon is caused by solar storms emitting high-speed charged particles colliding with gases in Earth’s atmosphere. The most common colour seen during this display is green, although other colours such as pink and red are sometimes visible as well.