用火車（排除更快的）與跑步等為計，設想出六種不同的速度與下場

来源: 走马读人于 2017-05-04 10:24:48 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

idea 起於Einstein 的加速度.

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.