how often is a leap year

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闰年多久一次

often adv. 常常；经常；时常；再三

leap n. 跳跃, 剧增, 急变, 被越过之物 vi. 跳跃, 突然经过 vt. 跃过, 使跃过

year n. 年；年纪；一年的期间；某年级的学生

how often is a leap year是什么意思 how often is a leap year怎么读 how often is a leap year中文意思翻译