The ejecta surrounding the lunar crater is just what one would expect from an explosion ejecting a large volume of dust, soil, and boulders.

围绕在月球陨石坑周围的喷出物，正是人们所能预料到的在一次爆炸中能得到的物质，爆炸喷发出大量灰尘、土壤和岩石。

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Chadwick: Clearly, there is a public health concern because of the fact that not all dust is derived from soil and therefore relatively benign.

查德威克：很明显，我们对公众健康问题有所担忧，因为事实上并不是所有尘土都来源于土壤从而相对无害。

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Dust and ash several feet thick smothered the fertile soil, rendering southern Japan uninhabitable for two centuries.

几英尺厚的灰尘和火山灰使肥沃的土壤窒息，致使日本南部两个世纪内都无法居住。

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He says there is likely more risk from lead dust on plants or from playing in the soil than from the plant itself.

VOA: special.2009.06.09

The good soil had turned to dust.

VOA: special.2009.05.10

Mangroves are the most readily available source of firewood for fires to boil seawater and what is called "salt dust" scraped from the soil.

VOA: standard.2010.03.29

The graves would then be filled with granite dust and soil.

BBC: Vaults at La Cimetiere des Freres, St Peter Port

They have been testing a laser system for measuring lunar dust and soil kicked up by rocket exhausts, and while using precipitation as a substitute to calibrate the laser, they found they could measure the average size of raindrops passing through it.

ENGADGET: NASA accidentally improves weather forecasting with lunar dust-measuring lasers

But such is their persistence that they can also be found in soil, sediment, food, air and house dust, and 97% of Americans have detectable levels in their bodies.

ECONOMIST: Fire retardants may affect female reproduction