随后，科学家跟踪瘦素下降原因，找到通路的源头——大脑下丘脑部。
The scientists then traced the leptin decline to a pathway that originates in the brain's hypothalamus.
委员会表示由于缺少蜜蜂健康数据将会影响对于蜜蜂数量下降原因的确定。
The lack of data on bee health has been a hurdle in identifying the causes of the population decline, the Commission has said.
加州卫生服务部的埃里·卡维斯硕士研究员，表示面向公众的健康宣传活动和媒体报道的可能是上述概率下降原因。
Researcher Erica Weis, MPH, of California's health services department, suggests that public health campaigns and media coverage of outbreaks may be responsible for the decline.
在女性中，总体癌症死亡率从1991年至2005年下降了11.4%，而其中乳腺癌及结直肠各自37%及24%的死亡率下降比率，占到总体下降原因的大约60%。
Among women, overall cancer death rates between 1991 and 2005 decreased by 11.4%, with decreases in breast (37%) and colorectal (24%) cancer rates accounting for 60% of the total decrease.
对文学小说兴趣的下降，也是莱斯利发现的原因之一。
The decline in interest in literary fiction is also one of the causes identified by Leslie.
在闷热潮湿的天气里运动能力下降的一个原因是，运动中的肌肉必须与皮肤争夺血液。
One reason performance declines on sultry, humid days is that working muscles have to compete with the skin for blood.
对于三岁的孩子来说，由于一些原因，他们的成绩并没有得到改善，只是因为改变而略有下降。
For three-year-olds, for reasons that are still in need of clarification, no improvement—rather a slight drop in performance resulted from the change.
研究人员观察了人们在一些活动上花费的时间，这些活动似乎是导致幸福感下降的原因。
The researchers looked at time spent in a number of activities that could plausibly be driving the well-being decline.
看电视可能会让你变得不那么开心，但这似乎不是近期导致年轻人平均幸福感下降的原因。
TV might make you less happy , but this is not what seems to be driving the recent declines in young people's average happiness.
导致视力下降的主要原因有两个：花在室内学习的时间太多，花在户外玩耍的时间太少。
Two main reasons can cause poor eyesight: too much time spent indoors studying and too little time spent outdoors playing.
谁也没有注意到进出口贸易繁荣的另一个原因：商品抵达市场的运输成本迅速下降。
One force behind the import-export boom has passed all but unnoticed: the rapidly falling cost of getting goods to market.
电视可能会让你不那么快乐，但这似乎并不是导致最近年轻人平均幸福感下降的原因。
TV might make you less happy, but this is not what seems to be driving the recent declines in young people's average happiness.
政府吝啬被指责是食品标准下降的原因。
Government penny-pinching is blamed for the decline in food standards.
“下降的原因之一是20世纪80年代的经济形势。”苏塞克斯大学的亚历山大·莫拉迪说。
"One reason for these decreases in height is the economic situation in the 1980s," said Alexander Moradi of the University of Sussex.
游客人数的增加是该市人口从20世纪50年代的17.5万人下降到目前人数的一个关键原因。
The tourist increase is one key reason the city's population is down from 175,000 in the 1950s.
在波兰，人口下降的原因与此不同。
In Poland, the population is going down for a different reason.
在我看来，电视是导致（学生）对学校的兴趣下降和我们整个教育系统失败的原因。
From my point of view, TV is the cause of the declining interest in school and the failure of our entire educational system.
欧洲宗教信仰的削弱可能是出生率下降的其中一个原因。
Eroding religious belief in Europe may partly explain lowered birthrates.
是什么原因导致猎鹰数量下降如此之快？
煤炭价格也很低，原因是供应过剩和需求下降，尤其是来自中国的需求，中国消耗了全球一半的煤炭。
Coal prices also are low, owing to oversupply and the scaling-down of demand, especially from China, which bums half of the world's coal.
失业率下降的原因不是因为创造了就业机会，而是因为愿意工作的人群，也就是劳动力队伍，并没有扩大。
The reason is that unemployment is falling not just because of job creation but because the pool of people who want to work, the Labour force, is not growing.
招生办的工作人员指出了几条申请人数下降的可能原因。
Admissions officers nationwide point to several possible reasons for the drop in applications.
这部分是由于同2006、2008年毁林率短期下降同样原因：农产品价格跳水。
This is partly because of tumbling prices for agricultural commodities, the reason for previous downward blips in 2006 and 2008.
但是，人民币升值也许不会导致美国失业人数大幅下降，主要原因有二。
But there are two main reasons that a stronger renminbi probably will not lead to a rapid hiring increase in the United States.
美国农民对如此高的产量感到自豪，同时粮食的高产也是食品价格下降的原因之一。
Farmers are proud of all that productivity, and it has driven crop prices down.
FDIC预计倒闭银行的数量明年将会下降，原因之一是地方性银行已经削减了大部分不良资产。
It expects the number of failures to start falling next year. It helps that regional Banks have cut down their most toxic assets.
但批评人士认为，喝酒应酬是日本人口持续下降的原因之一，特别是男性经常在外应酬，很少有时间在家。
But critics say the pressure to drink is one of the reasons why Japan's population is declining as men in particular spend little time at home.
她将下降的原因归结于世界杯，尽管如此，真人秀实际上并不会直接与足球现场直播相冲突。
She attributed the drop to competition with the World Cup, even though the show did not compete directly with live soccer broadcasts.
她将下降的原因归结于世界杯，尽管如此，真人秀实际上并不会直接与足球现场直播相冲突。
She attributed the drop to competition with the World Cup, even though the show did not compete directly with live soccer broadcasts.
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