Finding a blood stain on surfaces is harder than it sounds.

在物体表面找寻血迹比想象中可要难多了。

youdao

Bacteria linked to skin were most often found on surfaces people touched with their hands.

皮肤细菌最常见于人们用手接触的表面。

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In addition, protozoa were identified on surfaces which come into direct contact with meat.

另外，那些直接接触到肉的表面也要进行原生生物的鉴定。

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Studies have discovered evidence of harmful bacteria in toilets,on surfaces where food is prepared, even on home telephones.

VOA: special.2009.10.13

One such material is asphalt, a substance often placed on top of buildings and used to cover road surfaces.

VOA: special.2010.03.02

On the large paper surfaces he pieced together, he drew pictures using colors he made from crushed pencils and crayons.

VOA: special.2010.04.14

The mouse won't work on surfaces that pass through or reflect light, such as glass tabletops or mirrors.

CNN: Review: Apple Pro Mouse

It was an unexpected and novel difficulty because the troop was used to eating on surfaces without sand.

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Ozone-destroying reactions happen faster on surfaces, such as those provided by sulphate particles, than they do in the open air.

ECONOMIST: Geoengineering