Why does the world need leap seconds?
为什么世界需要闰秒？
Under an international pact, the preference for leap seconds is December 31 or June 30.
根据国际公约，一般在12月31日或6月30日在协调世界时中加入或减去闰秒。
Leap seconds were initially added at least once a year, but have slowed since 1979.
闰秒起先一年至少增加一次，但是自从1979年来就放慢了。
Leap seconds were initially added at least once a year, but have slowed since 1979.
闰秒起先一年至少增加一次，但是自从1979年来就放慢了。
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