Do you know when the first artificial satellite of America was launched?
你知道美国的第一颗人造卫星是什么时候发射的吗？
The orbit of the artificial satellite has an apogee of 200 miles from the earth.
这个人造卫星的轨道， 其最远点在离地球200英里的地方。
The orbit of the artificial satellite has an apogee of 200 miles from the earth.
这个人造卫星的轨道，其最远点在离地球200英里的地方。
The first artificial satellite.
第一颗人造卫星。
Since 1957 the Soviet Union launched the first artificial satellite, the space age has begun.
自从1957年苏联发射了第一颗人造卫星，人类的空间时代就拉开了序幕。
The first artificial earth satellite in the world has now been created.
世界上第一颗人造卫星已经诞生了。
The life of an artificial satellite.
人造卫星的寿命。
The life of an artificial satellite.
人造卫星的寿命。
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