词The first satellites placed in geostationary orbit were the synchronous communication(SYNCOM)satellites launched by NASA in 1963.
第一个放置在对地静止轨道的卫星是1963年美国航
暨太总署发射的同步传输卫星.
The first satellites placed in geostationary orbit were the synchronous communication(SYNCOM)satellites launched by NASA in 1963.
第一个放置在对地静止轨道的卫星是1963年美国航暨太总署发射的同步传输卫星.
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