将杀死的时间
The time to be killed
以上为机器翻译结果，长、整句建议使用 人工翻译 。
除此以外，还有“祖父悖论”：如果一个时间旅行者回到过去杀死了仍是孩子的祖父，进而导致了父亲甚至自己都不能出生。将发生什么事情呢？
What would happen if a time traveler killed his grandfather as a child, resulting in his father not being born and, in turn, his not being born.
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