迄今为止还没有充分证据表明火星上有生命，但这并不是说外层空间的研究没有科学价值。

So far there is little evidence of life on Mars, but this doesn't justify the conclusion that space research has no scientific value.

youdao

没有令人信服的证据证明火星上有生命存在。

There is no convincing evidence to prove the existence of life on Mars.

youdao