每七年，必须增加一个星期或者在日历上重新排列包含第53个星期的周期。
Every seven years, you must add a leap week or 53rd week to realign the period with the calendar.
每七年，你的身体就会有一个完整的新骨架生长出来。
About every seven years, your body replaces the equivalent of an entirely new skeleton.
导致的水位的急剧下降的干旱已经和厄尔尼诺现象联系起来，这种气候现象每两到七年会出现一次并改变世界范围内的天气形势。
The drought that caused the rapid decline has been linked to El Niño, a climate phenomenon that occurs every two to seven years and changes worldwide weather patterns.
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