As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.
该测速工具延续了系统级应用的简洁风格，界面动画流畅，无任何广告干扰，相比市面上第三方测速 App 更加轻量、直接。，详情可参考服务器推荐
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在 Android 平台上，由于原生支持 ByteArray，实现非常简单：使用类型别名直接映射，转换函数直接返回输入值，避免额外开销。