Corn is extensively used as feed for livestock, and because profit margins are tight in the livestock business, many farmers are expected to leave the business.
玉米被广泛用作牲畜饲料，由于畜牧业的利润率很低，许多农民预计将退出这一行业。
2
Critics say the digital access codes represent the same profit seeking ethos of the textbook business, and are even harder for students to opt out of.
批评人士说，数字接入码代表着教科书行业同样的逐利风气，让学生更难选择退出。
3
Critics say the digital access codes represent the same profit-seeking ethos of the textbook business, and are even harder for students to opt out of.