是血液和生物细胞内三大类物质之一，以单位重量所包含的能量（卡路里）计，类脂化合物是其它两种（蛋白质和碳水化合物）的两倍还要多。

One of the three large classes of substances in foods and living cells, lipids contain more than twice as much energy (calories) per unit of weight as the other two (proteins and carbohydrates).

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是血液和生物细胞内三大类物质之一，以单位重量所包含的能量（卡路里）计，类脂化合物是其它两种（蛋白质和碳水化合物）的两倍还要多。

One of the three large classes of substances in foods and living cells, lipids contain more than twice as much energy (calories) per unit of weight as the other two (proteins and carbohydrates).

youdao