嫦娥四号是历史上第一个成功登陆月球“暗面”的月球探测器。

Chang'e 4 is the first lunar probe in history that has successfully landed on the "dark" side of the moon.

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嫦娥四号月球探测器在月球背面（暗面）降落并轻轻地着陆，揭开了人类太空探索历史的新篇章。

Chang'e 4 lunar probe landed on the moon's far side (dark side) and softly touched down, which opened a new page in history of mankind's space exploration.

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另一方面，如果一地外的无线电信号能被探测到，那就将会是一个更为清晰且令人兴奋的时刻。

If, on the other hand, an alien radio signal were to be detected, that would constitute a more clear-cut and exciting moment.

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