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You show love by what you do, not just by what you feel.

不是你的感觉，而是你所做的显出你的爱。

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American psychologist Zick Rubin seeks to define love by psychometrics.

美国心理学家基克·鲁宾希望通过心理测量学来定义爱情。

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He had so totally given himself to scientific studies that he could not be weakened by a second love.

VOA: special.2009.09.26

Our best science suggests that a well-functioning body can perform these things, can think and plan and fall in love by virtue of the fact that the brain is functioning properly.

现今科学认为,一个运作良好的肉体能够做到以下事情,思考,规划,以及彼此相爱,这都得益于,大脑的正常运作

耶鲁公开课 - 死亡课程节选

She doesn't know any language, She doesn't know what I would be talking about by the nature of love.

它没有语言，它不知道我会谈论,爱的天性。

麻省理工公开课 - 电影哲学课程节选

The whole idea of marriage, in my view, is to have someone you love by your side.

FORBES: Is There Hope For Peace With YouTube 'Girlfriend' Appeal To Asma al-Assad

Don't Call This Love by Leon Jackson is released on 13 October.

BBC: Leon's quest for musical respect

The risk is that you then feel that love has died because, following the romantic myth, you measure love by its felt intensity.

BBC: Viewpoint: Down with romantic love