In its 40th year, Earth Day is intended to bring awareness about what people can do in their everyday lives to contribute to a cleaner more sustainable planet.

VOA: standard.2010.04.25

Because when you do favor to people, people are more likely to contribute to your campaigns.

当你为群众谋福时，人们更有可能,为你选举加油。

斯坦福公开课 - 经济学课程节选

How do those differences between cells contribute to the properties of the tissues, which contribute to the properties of the organs, which contribute to the properties of a person and this maintenance of homeostasis?

这些差异化的细胞,是如何构成具有不同属性的组织,这些组织又构成具有不同属性的器官,器官又构成了不同的人,它们是如何维护内稳态呢

耶鲁公开课 - 生物医学工程探索课程节选