Poultry meat is the primary animal protein in Africa (which has little to begin with) and the indispensable source of discretionary income for the survival of millions of small farmers.
Milk is well known as a great dietary source of protein and calcium, not to mention an indispensable companion to cookies.
牛奶作为蛋白质和钙的优良膳食来源为人们所熟知，更不用说它是甜点不可缺少的搭档。
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Among human being's food resources, protein is the major elements for the composition of body blood, tissue organs, also it is the indispensable nutritional element for body growth recovery.