慢速英语:New Plan for NASA Aims Beyond the Moon

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set foot on进入; 踏上

例句：They first set foot on our soil as adventures.
      他们起初是以冒险家身份踏上我国国土的。

2.Not having anything that they're striving for.

strive for力争…,争取…,为…而努力

例句：She strove for recognition as an artist.
      她为获得艺术家的声誉而奋斗。

3.He supports focusing on Mars rather than returning to the moon.

rather than(要)…而不…, 与其…倒不如…

例句：We'll have the meeting in the classroom rather than in the auditorium.
      我们与其在教室里开会, 不如在礼堂开会。

      They thus increased their annual grain production rather than diminished it.
      他们这样增加了而不是减少了粮食年产量。