SYN：在需要同步序列号的情况下设置。

Syn: Set in case the sequence Numbers need to be synchronized.

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“鑫诺二号”卫星于29日零时20分点火升空，25分钟后与运载火箭分离，进入地球同步转移轨道。

The satellite split off from the rocket about 25 minutes after its 00:20 lift-off, entering a geosynchronous transfer orbit.

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任务的主要目的是收集观测数据，用来检查由NASA的Aura号卫星同步收集的观测数据的准确性。

The primary purpose of the mission is to collect observations that can be used to check the accuracy of simultaneous observations collected by NASA's Aura satellite.

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