到目前为止，包括前四颗测试卫星在内的59颗卫星已经在西昌发射成功。

So far, 59 satellites, including the first four test ones, have been launched from Xichang.

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这一里程碑式的测试证实了该系统满足要求，并允许卫星进入最终的发射前出厂检验阶段。

Completion of this milestone confirms the system meets requirements and allows the satellite to proceed to final factory test activities prior to launch.

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工程人员讲到，要耗费几天时间去更换和测试开关盒，以确保燃料管道加热器正常运转。 上周五，仅在发射前几小时，“奋进号”飞船的发射被取消了。

Engineers say it will take several days to replace and test that switch box to ensure fuel line heaters are functioning properly.

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