Kendra Kielbasa says the Be a Santa for a Senior program succeeds because it brings the community together in a collective gesture of love and caring, and that,she says,is what the Christmas holiday is all about.

VOA: standard.2009.12.24

That is what he did over his Christmas vacation, wave mechanics.

这就是他在他圣诞节假期所做的，波动力学。

麻省理工公开课 - 固态化学导论课程节选

That is what he did over his Christmas vacation, wave mechanics.

这就是他在他圣诞节假期所做的，波动力学。

麻省理工公开课 - 固态化学导论课程节选