So we have four choices in terms of initial and final energy levels, and also what it means - in terms of the electron -- whether it's gaining energy or whether it's going to be emitting energy?

我们有这四个选项,各有不同的初始能量和末能量,它都是按照电子来说的,不管是失去能量还是得到能量？

麻省理工公开课 - 化学原理课程节选

oh, it's kind of hard to compare case 2 and 3 when we can't see it anymore.

噢，我们不太好比较第二和第三选项3,这里看不清了。

麻省理工公开课 - 化学原理课程节选

But how carefully you estimate will determine in part how good your ultimate records are so please try to be as careful as you can, and then pick the closest option if you can't find the exact food that you're eating at that time.

你估计的仔细程度,在某种程度上,也会决定最终结果的准确性,所以请尽可能谨慎,如果找不到完全对应的食物,请选择和你当时所吃食物最接近的选项

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选