英语翻译一句话 If you turn the picture around and you h

英语翻译一句话 If you turn the picture around and you h
英语翻译一句话
If you turn the picture around and you have some advanced extraterrestrials looking at the Earth, until
the last hundred years there was no evidence of intelligent
life but for billions of years before that they could have
deduced that this was a very unusual world and that there
were probably living creatures on it. They would have had billions of years to come investigate.