mù / qián / kē / xué / jiā / hái / wú / fǎ / zhèng / míng / shí / kōng / lǚ / xíng / shì / fǒu / zhēn / de / kě / néng目前,科学家还无法证明时空旅行是否真的可能。Scientists still cannot prove whether time travel is actually possible.