虽然某些项目的需求很直观—或许就像把一项新技术应用于一个著名的领域—但其它项目需求可能更复杂。

While the requirements for some projects are straightforward — perhaps as simple as applying a new technology to a well-known domain — others may be more difficult.

youdao

if you don't want to use that, you can also derive it as we did every time, it should intuitively make sense how we got there. But the exams are pretty short, so we don't want you doing that every time, so we'll save the 2 minutes and give you the equations directly, but it's still important to know how to use them.

吸收的和发射的，如果你不想用公式,你也可以每次都向我们这样推导它,很直观的就能得到结果，但考试时间很短，我们不希望你们每次都推导,所以我们会直告诉你，让你节省2分钟，但知道如何应用它十分重要。

麻省理工公开课 - 化学原理课程节选