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.
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，这一点在同城约会中也有详细论述
than the array approach.，更多细节参见爱思助手下载最新版本
kuikly Protobuf 使用文档：kuikly.tds.qq.com/DevGuide/pr…