Today we tell about the development of what scientists are calling a synthetic cell - a cell produced by people instead of by nature.

VOA: special.2010.07.20

And what I want to do now is illustrate a case study of what I mean by nature constrained and why it is so important for happiness, for wellbeing, for long-term success to have the constrained view of human nature when it comes to our psychology that is.

现在我想演示一个案例研究,说明我所谓的本性受约束的含义,为何它对快乐，幸福，长久的成功如此重要,当论及到我们的心理时,人性受约束观点很重要。

哈佛公开课 - 幸福课课程节选

She says that the goods and services provided by nature - like clean air, rain or fertile soils - should not be taken for granted.

VOA: standard.2010.02.24

But he made clear it is regional in nature - designed to deal with the threat posed by militants and extremists on both sides of the Afghan-Pakistan border.

VOA: standard.2009.03.26