There are other factors involved too like high energy prices, but certainly U.S. policy is affecting that, but we're also affected by the rest of the world.

还有诸如能源价格高昂等其它因素,但美国的政策肯定是有影响,但世界其它地区的情况也影响了我们

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du/dT constant pressure is the direct derivative with respect to temperature here, which is sitting by itself under constant volume keeping this constant but there is temperature sitting right here too.

偏U偏T，p恒定是对,温度的直接微分，而它本身对体积不变,保持它不变，但是这里也有一个温度,这就是偏U偏V，T恒定。

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