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?
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