In the past few years, however, new satellite images have provided much more compelling evidence that stable, Earthlike conditions prevailed on Mars for long periods.

• 然而过去几年来，来自轨道卫星的新影像又提供了更多引起注意的证据，显示火星上曾是类似地球的稳定环境，而且持续了很长一段时间。