Most familes do not have electricity and may not even have candles for their children to study by.
大多数家庭没有电，甚至可能没有蜡烛供孩子学习用。
A new study by the University of Minnesota and McGill University in Montreal looks at where, and how far, this decline is occurring.
明尼苏达大学和蒙特利尔的麦吉尔大学的一项新研究着眼于这种衰退发生的区域和程度。
That is one reason why America absorbs immigrants better than many other rich countries, according to a new study by the University of California.
根据加州大学的一项新研究，这是美国比其他许多富裕国家更好地吸收移民的原因之一。
According to a study by George Borjas, a Harvard economist, immigration reduced the wages of American high-school dropouts by 9% between 1980-2000.
根据哈佛大学经济专家George Borjas的一项研究，外来移民使美国高中辍学生的工资在1980-2000年间减少了9%。
The gold standard study by Harvard and Columbia University scholars found that even in high-poverty schools, teachers consistently had a huge positive or negative impact.
哈佛大学和哥伦比亚大学的学者们进行的“黄金标准”研究发现，即便是在极度贫困的学校，教师也始终会产生巨大的，或积极或消极的影响。
A study by the Center for Research on the Epidemiology of Disasters finds that, between 1980 and 2007, nearly 8,400 natural disasters killed more than two million people.
灾害流行病学研究中心的一项研究发现，在1980年至2007年间，近8400起自然灾害导致200多万人死亡。
This is from a classic study by Tolman where rats were taught to run a maze.
这是托尔曼的经典实验——训练白鼠走迷宫。
At present there are many online courses and we can choose some to study by ourselves.
目前有很多在线课程，我们可以自己选择一些来学习。
Our school hopes to improve students' abilities to study by themselves and work in groups.
我们学校希望提高学生的自学能力和小组合作能力。
It is always more important to know how to study by oneself than to memorize some formulas.
知道如何自学永远比记住一些公式更重要。
According to a study by Catalyst, between 2010 and 2015 the share of women on the boards of global corporations increased by 54 percent.
根据Catalyst的一项研究，2010年至2015年间，全球公司董事会中女性的比例增加了54%。
According to a study by Australian National University, Australian children and Chinese children have the same level of eyesight before they start school, but once they enter primary school, Chinese children only spend about an hour a day outside, while Australian children spend three to four hours each day in the sunshine.
澳大利亚国立大学的一项研究显示，澳大利亚的孩子和中国的孩子在入学前的视力水平相同。但是一旦他们进入小学，中国的孩子每天只会在户外度过一个小时，而澳大利亚的孩子每天在阳光下待三到四个小时。
你可以自学。
你可以自学。
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