华盛顿方面的立场也在变得越来越强硬。过去两周中，美国的措辞带上了更具对抗性的语气。
A similar hardening of positions has been taking place in Washington, with U.S. rhetoric assuming a more confrontational tone in the past two weeks.
过去对于小白鼠的研究中发现空气污染对于胰岛素的抵抗性有很大关系，这是第二类糖尿病的主要发病因素。
Previous studies in mice have suggested that air pollution is associated with insulin resistance, a precursor condition to type 2 diabetes.
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