Why We Must Place Clocks on the Moon为什么要把时钟送到月球

Perhaps the greatest， mind-bending quirk of our universe is the inherent trouble with timekeeping： Seconds tick by ever so slightly faster atop a mountain than they do in the valleys of Earth. For practical purposes， most people don’t have to worry about those differences.

也许我们宇宙中最令人困惑的奇异现象就是关于计时的固有难题：地球上，时间在山顶会比在山谷过得略快。（剩余9064字）