想像一下,如果汽車在德國高速公路上加速到 999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999 x 999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999⁹⁹ MPH。