Some experts suggest taking pictures of moles and dating the images to compare over time.

VOA: special.2010.07.06

So let's compare what some of the similarities and differences are between hydrogen atom orbitals, which we spent a lot of time studying, and now these one electron orbital approximations for these multi-electron atoms.

很长时间的氢原子轨道和,现在多电子原子中,的单个电子轨道近似，我们可以对比，它们之间,的相似性和不同。

麻省理工公开课 - 化学原理课程节选

Lent is you give up one thing, so I tend to give up sugar and meat during that month. For the entire time, listen it doesn't compare to Ramadan, where you really have no water.

在大斋期，你要放弃一样东西,因此我在那个月不吃糖和肉，但是这和，赖买丹月无法相比，因为在赖买丹月你甚至都没水喝。

普林斯顿公开课 - 人性课程节选