For example, lightning can create tubes of glass when it strikes sand that has the right combination of minerals.

VOA: special.2009.09.16

There is something that one might be able to hold on to: the knob of something, the little flame of something that ; The grain of sand. -The grain of sand; but there is really not a decent metaphor for it, I think.

一个你可以依靠的支点：,一个不同寻常的想法，一个思想的小火花,就像一粒沙中看世界，-一粒沙中看世界;,不过我认为任何比喻都不够贴切。

普林斯顿公开课 - 人性课程节选

I like it. There's sun, sand, sea, so.

我非常喜欢我的国家。那里有太阳、沙滩和海。

请支持一下社团小组 - SpeakingMax英语口语达人

To get at deeper deposits engineers inject steam via pipes to heat the bitumen and separate it from the sand so it can be sucked out.

FORBES: Crude Awakening

She said most homeowners do not begrudge laws protecting the plover, a compact, pale shorebird with coloring that makes it all but vanish against the open sand flats where it nests.

WSJ: NY's Fire Island debris effort faces bird deadline

With 170 acres of sand, it is the largest urban beach in the country.

BBC: Easy breaks from New York City