And everybody understands mileposts, you know.

每个人都能理解里程碑的概念，你知道的。

Instead we must mark our journey with mileposts of our own invention, seconds minutes, hours, days, weeks, months, and years.

相，必须用自己的发明来记的旅程，比如秒、、时、天、周、月和年。

Where the City ends there is a great road winding off to the north, and we Street Sweepers must keep this road clean to the first milepost.

在城市的尽头， 有一条大路蜿蜒向北， 清道夫必须保持这条路清洁到第一个里程碑。