Children can be directly ingesting potentially harmful, chemical residue invisible to us.

儿童则更有可能直接吃下看似不存在的有害物质。

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You should use white towels because the dyes in colored towels can leave a chemical residue on the paint, and cause streaking.

您应该要使用纯白的毛巾因为非纯白的毛巾上的色素可能会因为化学物质影响下而残留在漆面上因而产生一些痕迹。

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Supercritical fluid extraction as a sample preparation tool for harmful chemical residue analysis in analytical toxicology are reviewed.

综述了超临界萃取作为样品制备技术在痕量药检分析中的应用。

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Memories are not held in their entirety in the brain like old movie clips, but are maintained as a kind of chemical residue of the original perception, which could be thought of as a hash value or remainder, but not a one-way algorithm at all.

FORBES: Density Of Meaning: Creation As The Flip Side Of Memory

Soil samples can be taken in which you can look for either residue of a chemical agent or the product's characteristic of when an agent degrades.

BBC: Syria chemical weapons claims: UK and US tread cautiously