意思Scientists now believe that the planet could once have supported life
问题描述：
意思Scientists now believe that the planet could once have supported life
答
Scientists now believe that the planet could once have supported life.
现在科学家们相信(认为)这颗星球(行星)上可能曾经有过生命(的存在).
答
现在科学家们相信这颗星球上曾经孕育过生命。
答
科学家现在认为这颗行星曾经有维持生命的条件.
答
科学家现在认为该星球曾经养育过生命。