能給個語境嗎,否則難以下手.So the earth is spinning fast because the reservoirs have redistributed the water close to it’s axis. And because the earth was spinning fast, since 1950 the length of day has decreased by dot 8 million of second. I know that doesn’t sound like much but significant in that this is the first time that human beings ever had miserable affect on the earth motion.我猜可能是0.0.....8秒的意思你好。應該是：dot 8 million of a second=0.0000008秒。= 8 millionth of a second翻譯：八百萬分之一秒又如：A microsecond is a millionth of a second. A microsecond is dot a million of a second. 1微秒就是一百萬分之一秒。