At one time it was thought that these matrix grains might be pristine nebular dust, the sort of stuff from which chondrules and inclusions were made.

曾经有人认为，这些基质颗粒可能是原始的星云尘埃，即形成陨石球粒及其内含物的物质。

youdao

The dust at the bottom of the SPA Basin really does have a fascinating story to tell.

SPA 盆地底部的尘埃确实蕴含着一个引人入胜的故事。

youdao

I'm looking at the dust.

我在看灰尘。

youdao

Miners and chemical workers are at risk of COPD from breathing dust and harmful chemicals.

VOA: special.2010.06.23

They stopped at every stream to drink and wash the dust from their faces.

VOA: special.2009.08.27

"It is not just a case of understanding the activity at the volcano itself, what we are also seeing the effect of at the moment are the prevailing weather conditions because we are in a northerly air stream at the moment and that is bringing the volcanic dust from Iceland down over the U.K.

VOA: standard.2010.04.15

Time to panic, then, or at least dust off those doom-laden predictions of a double-dip recession?

ECONOMIST: Still on amber

"I had restricted lung breathing, stomach problems" related to breathing toxic dust at ground zero, Russo said.

WSJ: NY town of 9/11 workers wages gas pipeline fight

The new safety level is about 100 times higher than the background level of dust at ground level.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The