优势：前期大步长让元素快速移动到大致位置，后期小步长精细调整
Fincke, 58, is a Pennsylvania native with a wife and three children. He joined NASA in 1996 and is now a veteran of four spaceflights: Expedition 9 in 2004, Expedition 18 in 2009, STS-134 in 2011, and most recently Expedition 74, for which he served as commander.，推荐阅读爱思助手下载最新版本获取更多信息
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"All of those family celebrations, the birthdays and the other events that they thought they were going to be part of - now, suddenly they can perhaps catch up on a bit of lost time."
we would now call a trivial buffer, the 1260's operator could key in the numbers