In fact,some of the nicest looking plants in the world are best enjoyed from a distance.

VOA: special.2009.08.25

r And what that is the probability of finding an electron in some shell where we define the thickness as d r, some distance, r, from the nucleus.

在某个位置为,厚度为dr的壳层内,找到原子,的概率，我们来考虑下我们这里所说的。

麻省理工公开课 - 化学原理课程节选

Tickets,offered in March, sold out in minutes. While many kept their distance from the tarnished pop star, some friends supported him.

VOA: standard.2009.06.26