If you represent the Earth's lifetime by a single year, say from January when it was made to December, the 21st-century would be a quarter of a second in June -- a tiny fraction of the year.
如果用一年来代表地球的整个历史进程， 也就是说把地球诞生视为一月直到它毁灭为十二月， 21世纪相当于六月份中四分之一秒的时间 - 这象征性的一年中的短短一瞬。