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闰秒 /rùnmiǎo/ meaning in English

ChineseEnglish
闰秒 /rùnmiǎo/ noun

leap second(a second of time added to the year occasionally to compensate for variation in the rate of Earth's rotation relative to the absolute standards of time)
noun
[UK: liːp ˈsek.ənd] [US: ˈliːp ˈsek.ənd]