課本第53頁第12行翻譯

Primary productivity is similar to the rate at which you make money, or the number of dollars you earn per year. Net primary productivity(淨初級生產力
) is like the amount of money earned per year that you can spend after subtracting your work expenses such as transportation, clothes, food, and supplies.
初級生產力是類似你賺錢的速度，或每年你美元收入的數量。淨初級生產力就像每年賺取的金額，減去你的開支之後你可以花費的量，如交通運輸，服裝，食品和用品。
Ecosystems and life zones differ in their NPP as illustrated in figure3-17.despite its low NPP, the open ocean produces more of the earth’s biomass per year than any other ecosystem or life zone, simply because there is so much open ocean.
生活區和生態系統不同於他們的淨初級生產力如圖3-17所示.儘管它的低的淨初級生產力，每年開闊的大洋產生更多的地球生物量比其他任何生態系統或生活區，就是因為有如此多的海洋。