But the leap second is a newcomer.
不过闰秒是个新事物。
The last time a leap second was added was in the dying moments of 2005.
上一次的闰秒发生在2005年的最后时刻。
This year, the world’s timekeepers will add its 24th leap second since 1972.
今年，全世界的计时员将自1972年以来第二十四次增加闰秒。
A leap second is added in order to keep UTC within 0.9 seconds of observed astronomical time.
添加闰秒是为了将UTC保持在观察到的天文时间的0.9秒范围内。
The next leap second comes at the end of this year.
下一次的闰秒将出现在今年末。
Britain, for example, has said that the leap second should stay.
举个例子，英国就表示闰秒应该保留。
This year, the world's timekeepers will add its 24th leap second since 1972.
今年，全世界的计时员将自1972年以来第二十四次增加闰秒。
In practice, though, many people will be watching the television or an analogue clock, and will not notice the leap second at all.
实际上，到那时候大多数人都在看电视或盯着模拟时钟，那他们就不会注意到有闰秒了。
Since 1999 until recently, the two time standards have been in close enough synch to escape any need to add a leap second, NIST said.
该协会说，从1999年开始到最近几年，原子时和天文时一直处于同步状态，所以不需要增加一个闰秒。
US scientists want to change the current system, which keeps clocks in synch with solar time by adding a leap second every 18 months or so.
美国科学家希望改变现行系统，亦即透过每隔约18个月添增1闰秒，让时钟与太阳时保持一致。
"A leap second does cause considerable problems for many systems that require it to be applied simultaneously in a large number of places," said Whibberley.
韦博利说：“因为‘闰秒’工作要求在许多地区同时进行，这可能会给许多系统带来麻烦。”
A leap second is an extra second added to the last day of the month of March, June, October or December which means that the last minute in the day for that month has more than 60 seconds.
闰秒是向3、6、10或12月的最后一天添加的1秒，这意味着该月份的最后一天的最后一分钟不止60秒。
A leap second is an extra second added to the last day of the month of March, June, October or December which means that the last minute in the day for that month has more than 60 seconds.
闰秒是向3、6、10或12月的最后一天添加的1秒，这意味着该月份的最后一天的最后一分钟不止60秒。
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