随着航天飞机的出现，空间飞行已经成为一个国际性的以赢利为目的的事业。

Because of the shuttle, space flight has become an international commercial enterprise.

youdao

随着航天飞机的出现，空间飞行已经成为一个国际性的以赢利为目的的事业。

Because of the shuttle, space flight has become an international commercial enterprise.

youdao