是的，有一类脂类在我们的身体里无法自己合成，这意味着我们必需从食物中吸取。

Yes, there are some fats that our body cannot produce which means that we must get them from our food.

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类脂是脂类分子的总称，例如动物脂肪与蜡类，它们不溶于水。

Lipids are a broad group of molecules such as fats and waxes that don't dissolve in water.

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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).

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Steroids are small molecules - much smaller than proteins - smaller molecules that tend to be hydrophobic or lipid soluble.

类固醇是小分子物质,比蛋白质小得多,这类小分子是非水溶性的,或者说是脂溶性的

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So most of the lipids, which make up cell membranes in your body are of this category of phospholipids.

大部分脂类,那些在你体内构成细胞膜的脂类,都属于磷脂类

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Fatty acid chains are fat molecules, they behave, if you have a lot of them in solution like oil.

脂肪酸链就是脂肪分子,它们看上去好像,如果你见过富含脂类的溶液,比如油

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