不同于动物蛋白质，植物蛋白质少一些成分，缺少人体获取和分解蛋白质所需的一种或多种氨基酸。
Unlike most animal protein, plant proteins are incomplete, lacking one or more of the amino acids that your body needs to make and utilize proteins.
乳铁蛋白是母乳中自然存在的一种蛋白质，可以帮助婴儿抵抗有害细菌和真菌的侵袭，但是配方奶粉中却缺少这种成分。
Lactoferrin is a naturally occurring protein in humans that provides babies with bacterial and fungal protection, and it's distinctly lacking in artificial formula.
膳食纤维主要成分是一种叫做纤维素的聚合物。由于缺少必需的消化酶，人类无法消化纤维素。
Fiber is mostly made up of a polymer called cellulose, which is not digested because humans do not have the necessary enzymes to process it.
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