一个名叫大卫的年轻人对这个消息特别兴奋，因为他自己有种花的经验。

One young man named David was especially excited about the news, because he had experience in growing flowers himself.

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其中一名登山者是一个名叫大卫的8岁男孩。

One of the climbers was an 8-year-old boy named David.

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他们有两个孩子，一个是儿子，名叫大卫。

They have two kids, one is a boy, his name is David.

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There is a researcher at The Harvard Medical School named David Ludwig who's done a terrific series of studies on the glycemic index and found how it relates to food intake, body weight regulation, and health.

在哈佛医学院有一个研究员,名叫大卫·路德维格,他在血糖指数方面,做了一系列出色的研究,并发现了血糖指数与食物摄取,体重控制以及健康之间的关系

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选