这一发现已在美国国家科学院院刊（PNAS）上发表了。
The findings have been published in the medical journal PNAS.
研究表明，现已在美国广泛生产的玉米基生物乙醇，对比传统燃料而言，给环境和健康带来更大的负担。
The study shows that corn-based bioethanol, which is produced extensively in the US, has a higher combined environmental and health burden than conventional fuels.
《国际糖尿病》：GLP- 1类似物现已在美国市场得到广泛应用。您可以给我们介绍一下这些药物的使用时间吗？
International Diabetes: the GLP-1 analogues have been widely available in the us market now. Can you tell use about the application timing of these drugs?
美国经济曾为高中毕业生提供的工作保障现已在很大程度上逐渐消失。
The job security that the US economy once offered to high school graduates has largely evaporated.
美国八个最大的州中，克林顿夫人现已在其中七个州取胜，并且其中有三个最重要的形势不明的州。
Mrs Clinton has now won the primaries in seven of America's eight biggest states, and its three most important swing states.
美国八个最大的州中，克林顿夫人现已在其中七个州取胜，并且其中有三个最重要的形势不明的州。
Mrs Clinton has now won the primaries in seven of America's eight biggest states, and its three most important swing states.
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