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.
每七年，健康的人体的骨骼细胞会更新一遍。
Every seven years, a healthy human body completely replaces every single bone cell.
厄尔尼诺现象是自然气象周期的一部分，大约每三至七年发生一次，对世界气候产生一年或更长时间的影响。
It is part of a natural meteorological cycle that happens roughly every 3-7 years and affects weather worldwide for a year or more.
颁布后的标准，原则上每五至七年会修订一次。
After the enactment of the standard, in principle every five to seven years will be revised again.
每两到七年，当环绕太平洋热带水域的盛行信风减弱时，就会出现厄尔尼诺现象。
Thee El Nino phenomenon occurs every two to seven years, when the prevailing trade winds that circulate surface water in the tropical Pacific start to weaken.
最好的保证独立性（同时削弱大公司的抑制）的办法是强制性的轮换：客户被要求每七年左右委任新的审计公司。
The best way to ensure independence (and weaken the stranglehold of the big auditors) is compulsory rotation: clients should be required to appoint a new firm every seven years or so.
每两到七年，当环绕太平洋热带水域的盛行信风减弱时，就会出现厄尔尼诺现象。
The El Nino phenomenon occurs every two to seven years, when the prevailing trade winds that circulate surface water in the tropical Pacific start to weaken.
树的年轮、冰轮的研究证明了后来厄尔尼诺现象以七年为周期的，仍然比现在的每三年或四年发生一次的频率要低得多。
Studies of tree rings and ice cores indicate a more recent cycle of seven years, still much less frequent than the present cycle of every three or four years.
厄尔尼诺是赤道附近的太平洋周期性变暖现象，引发风暴和其它气候事件，历史上每三至七年发生一次，持续时间可长达两年。
El Ni? O, the periodic warming of the equatorial Pacific that induces storms and other climatic events, historically occurs once every three to seven years and lasts for up to two years.
厄尔尼诺是赤道附近的太平洋周期性变暖现象，引发风暴和其它气候事件，历史上每三至七年发生一次，持续时间可长达两年。
El Ni? O, the periodic warming of the equatorial Pacific that induces storms and other climatic events, historically occurs once every three to seven years and lasts for up to two years.
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