The first two questions are the hard ones, and will dictate the answer for the third question.

前两个问题很难回答，它们将决定对第三个问题的回答。

youdao

The first question has aclear answer: Yes, we probably could. Spacecraft, including the ones nowexploring Mars, have found evidence that it was warm in its youth, with riversdraining into vast seas.

通过宇宙飞船发回的数据（包括目前正在火星探测的飞行器在内），我们已经发现有证据可以表明，在火星形成初期，它的气候温和，有一段时间曾有河流流入汪洋大海的迹象。

youdao

The first question has aclear answer: Yes, we probably could. Spacecraft, including the ones nowexploring Mars, have found evidence that it was warm in its youth, with riversdraining into vast seas.

通过宇宙飞船发回的数据（包括目前正在火星探测的飞行器在内），我们已经发现有证据可以表明，在火星形成初期，它的气候温和，有一段时间曾有河流流入汪洋大海的迹象。

youdao