The vehicle's first stage engine had already accumulated more than 10,000 seconds of firing during tests - an important milestone on the way to its certification for real missions.
运载工具的第一级引擎在测试过程中的点燃时间已经累计达到了10,000多秒——-这是达到它能完成其真正使命的捡定过程中的一个重要里程碑。
The certification includes a first stage and second stage audit audit.
认证审核包括第一阶段审核和第二阶段现场审核。
The first paragraph of this blog post set the stage for the first way to value a certification.
这篇博客的第一段为第一种评估方法铺平了台阶。
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