利用OGY方法必须预先知道系统要被稳定的周期轨道,并且这种方法控制的实时性较差。
But the periodic orbit of the system must be found, before OGY method can work.
这种周期性轨道只是彗星生命中的一个阶段。
This kind of periodic orbit is only a phase in a comet's life.
地球轨道的周期性变化会影响地球的气候。
Periodic changes in Earth's orbit could affect Earth's climate.
被扔的三明治的,轨道周期是多少?
城市轨道交通是一项建设和运营成本高、财务周期长的巨型工程。
URT is a big project with high building and operating cost and long financial period.
其中一颗三十天沿轨道运行一周,而另一颗所需时间恰好是它的运行周期的两倍。
One takes 30 days to complete an orbit, the other exactly twice as long.
其中一颗三十天沿轨道运行一周,而另一颗所需时间恰好是它的运行周期的两倍。
One takes 30 days to complete an orbit, the other exactly twice as long.
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