Dust sample in blast pipe was collected when centralized air ventilation system was off, the total content of the bacterium and fungus was examined.

集中空调关闭期间，采集集中空调通风系统送风管内的积尘样品，检测其细菌总数、真菌总数；

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They then linked each sample with its likely source region and calculated the rate of dust deposition over time.

之后研究人员通过沙尘样本找寻到其对应来源地，并计算这些沙尘随时间积聚的速率。

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The Japanese, like the Americans, have experience with sample-return of this sort, having flown a probe called Hayabusa that retrieved dust from the plume of a comet in 2010.

日本科学家和美国科学家一样，掌握相似的返回样本，曾在2010年利用探测仪隼鸟号从一颗彗星羽中检测到灰尘。

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But the desire of businesses to sample Texas trail dust pre-dates Rick Perry.

WSJ: Henninger: The Perry Paradox

Three days later when the first men to reach another world arrived, their initial act, within moments of setting foot there, was to document and collect a precious sample of lunar dust, to share with laboratories across the Earth.

BBC: The magic of Apollo

Although this is a small sample, it suggests that man-made dust particles predominate over naturally occurring ones.

ECONOMIST: Orbital debris