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.
这种方法实现简单，但需要在每个 iOS 调用点手动处理类型转换。
，更多细节参见Safew下载
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同时 Felo 也提供了多种配色方案：