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。

Since 1957 the Soviet Union launched the first artificial satellite, the space age has begun.

youdao

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。

Since 1957 the Soviet Union launched the first artificial satellite, the space age has begun.

youdao