The more worrying changes are happening on a chemical level.

更令人担忧的变化发生在化学层面。

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There are tens of thousands of proteins in the body that build and control life at the chemical level.

在我们的身体里存在着上万种蛋白质，它们以化学方式建立和支配生命。

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Complete product high - medium - low, food grade, chemical level. Have food grade QS (inspection certificate), welcome customers to negotiate the choose and buy.

产品高-中-低档齐全，食品级，化工级。已取得食品级QS(商检证)，欢迎广大客户洽谈选购。

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Feczko emphasized that these drugs are different from Vioxx on a chemical level.

FORBES: Pfizer's Tough Sell

Only chemical chromatography that measures several samples for their average level of capsaicin, the chemical that gives peppers their bite, can establish a record claim.

WSJ: Arms Race to Grow World's Hottest Pepper Goes Nuclear

The low-level but frequent release of this chemical ensures regular anti-bacterial washes of the wound.

ECONOMIST: Honey may help in the battle against superbugs