名词
中文翻译：预备轨道
同义词：
['initial orbit', 'preliminary orbit']
例句：
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1.The spacecraft's preliminary orbit was carefully calculated before launch.
在发射前，航天器初步轨道的计算被仔细进行了。
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2.The team spent several weeks preparing for the preliminary orbit test.
团队花了几个星期准备初步轨道测试。
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3. During the initial phase of the mission, the astronauts conducted a preliminary orbit around the planet.
任务初期，宇航员们围绕行星进行了初步轨道运行。