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。
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。
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。
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