经过八周的实验，相比较于第二组暴露在自然光——黑暗循环下的老鼠，第一组和第三组的老鼠体重的增长幅度高出50个百分点。
Over the eight-week period of the experiment the mice inthe first and third groups gained almost 50% more weight than those exposed tothe natural light-dark cycle.
距离我第二个澳大利亚铁人赛已经过去八周了，在比赛中我取得了11小时58分的成绩，比我今年早些时候的成绩快了15分钟。
It has been eight weeks since I finished my second Ironman Australia triathlon in 11 hours and 58 minutes, which was 15 minutes faster than the year earlier.
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