Since the American study of 1997 raised the spectre of a connection between weight and early puberty, scientists have become convinced that there is at least some link with the obesity epidemic.
自从美国1997年的那项研究提出体重与青春发育期提前之间隐约存在联系，科学家已经相信，青春发育期至少与肥胖流行有某种联系。
American scientists say depressed fathers are very likely to affect and hamper their children's language abilities, according to a study of over 5000 families.
据美国学者发现，父亲患抑郁症会直接影响孩子的语言能力发育。这是美国一家医院学的研究人员对5000个家庭进行调查后发现的。
American scientists are to study, after 25 years of time, to make this judgement.
科学家是以美国黑人为研究对象，经过了25年的时间之后，做出此判断的。
American scientists in the study found that seaweed and kelp contains a lipid fatty acid called material.
美国科学家在研究中发现，海藻和海带中含有一种叫硫酸脂的脂肪物质。
Two biotic indices, Biotic Coefficient (BC) and Benthic Index of Biological Integrity (B-IBI), recently suggested by European and American scientists were applied and commented on this study.
应用和验证了国外新提出的生物系数（BC）和底栖生物完整性指数（B-IBI），对其局限性和可行性进行了分析。
Citing a study in the American journal Psychological Science, it said the public apparently thinks climate scientists are less certain about their conclusions than they actually are.
报道援引美国《心理科学》杂志称，公众显然认为气候学家并不确信他们得出的结论。
Citing a study in the American journal Psychological Science, it said the public apparently thinks climate scientists are less certain about their conclusions than they actually are.
报道援引美国《心理科学》杂志称，公众显然认为气候学家并不确信他们得出的结论。
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