号召要求服务在这些演讲中有着悠久而丰富的传统。

Calls to service have a long, rich tradition in these speeches.

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如果乘客想使用这些服务，他们将被要求购买普通票。

Passengers will be asked to buy regular priced tickets if they want to use these services.

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现在，电击训练和医疗服务正在拯救这些大型鸟类。

Now, electric shock training and medical treatment are helping to rescue these big birds.

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The point is that they have received what they have through the free exchange of people who have given them their holdings, usually in exchange for providing some other service Good enough.

关键是，他们赚到的这些钱,都是通过与人自由交换得来的,那些人也得到了报酬，通常是以提供其他服务作为交换的,很不错。

耶鲁公开课 - 公正课程节选

and not only the fashion but the cause and the reasons that these non-profits serve

不仅仅是时尚，还有这些非营利性组织所服务的事业和其原因，

关于自由和时尚 - SpeakingMax英语口语达人

There are services now, we don't know yet how to get those stem cells out of cord blood and how to use them for therapies, but it's reasonable to think that we might know about this in 30 years.

现在已经有提供这样的服务了,我们现在还不知道如何从脐带血中,提取这些干细胞并用于治疗,但有理由相信,在未来的30年内我们会知道的

耶鲁公开课 - 生物医学工程探索课程节选