Humans may be the only creatures on Earth who spend significant time thinking about the fact that someday their lives will end.

Humans may be the only creatures on Earth who spend significant time thinking about the fact that someday their lives will end.

人类可能是地球上唯一一个花大量时间思考生命终有一天会终结这一事实的生物。

-- Joan D. Vinge 琼·D·温格