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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