surface union的意思|示意

The Soviet Union was first to land a spacecraft on the moon, in 1959, but NASA’s Neil Armstrong becomes the first human to set foot on the lunar surface, realizing humanity’s age-old dream.

苏联首次使用航天飞船登陆了月球。

The union will start with a European-led orbiter in 2016, and continue with surface rovers in 2018, and then perhaps a network of landers in 2018.

这个联合项目将在2016年以一个欧洲主导的轨道飞行器项目开始，2018年开始火星车项目，之后是2018年的着陆工程。