食物中的能量按三种化学物质的形式存在---糖类，蛋白质和脂肪。
The energy in food is in the form of three kinds of chemical materials---carbohydrate, protein and fat.
结论东莞地区职业性接触性皮炎主要变应原为三种化学物质，调查结果有助于临床指导该疾病的预防和治疗。
Conclusions the main allergens of occupational contact dermatitis in Dongguan city are three kinds of chemical materials. This study is helpful to the prevention and treatment of the disease.
第三种是某些基本的化学物质，如碳、氧和氮。
A third is certain basic chemicals such as carbon, oxygen and nitrogen.
化学家们确实发现了少量残留的三种可疑的化学物质，但他们指出这些化学物质在所有罐头食品中都会自然产生。
The chemists did find small amounts of the three remaining suspected chemicals but pointed out that these occur naturally in all canned foods.
还有第三种脑化学物质也是不可或缺的。
化学家确实发现剩下三种受怀疑的化学物质在所有其他罐头食品中都存在。
The chemists did find that the three remaining suspected chemicals are naturally found in all other kinds of canned foods.
化学家确实发现剩下三种受怀疑的化学物质在所有其他罐头食品中都存在。
The chemists did find that the three remaining suspected chemicals are naturally found in all other kinds of canned foods.
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