More than two hundred million kilometres from Earth, a spacecraft has just done something its engineers could not control in real time: it let go of the engine that carried it toward Mercury.
arrival phase：抵达阶段spacecraft stack：航天器组合体transfer module：转移模块separate：分离orbit insertion：进入轨道flyby：飞掠，借助行星引力改变飞行状态telemetry：遥测，航天器传回的状态数据nominal：正常，处于预期状态polar crater：极区陨石坑magnetic field：磁场real-time intervention：实时干预After nearly eight years in space, BepiColombo's two science orbiters are now on their way towards orbit insertion around Mercury.BepiColombo's two science orbiters are now on their way，意思是“BepiColombo 的两颗科学轨道器正在前往下一个阶段”。句首的 After nearly eight years in space 交代时间背景；towards orbit insertion around Mercury 说明它们前往的目标是“进入水星轨道”。esa.int
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