futuristic幻想未来的；想象未来情况的

If there was one futuristic invention that you could own, what would it be?

如果你能拥有一项未来的发明，你希望是什么？

This is a futuristic novel.

这是一部幻想未来的小说。

time travel 时空旅行；穿越时空

Will time travel ever become a reality?

时光旅行真的会成为现实吗？

Time travel may be imperceptible.

时间旅行也许是不可感知的。

off the top of one's head 不假思索地；即兴地

It was the best I could think of off the top of my head.

这是我能马上想出的最好办法。

He said yes off the top of his head.

他不假思索地同意了。

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