review previous year's sales and plan for the next year
profit margin 利润率
A profit margin is the difference between the selling price of a product and the cost of producing and marketing it. 利润空间 [商业]（the amount by which revenue from sales exceeds costs in a business.）
例：
The group had a net profit margin of 30% last year.
该集团去年的净利润空间为30%。
margin [ˈmɑːrdʒɪn] n. 页边空白；差额，幅度；盈余，利润；余地，备用的时间（或空间、金钱等）；边缘，非主体部分；保证金，押金；<澳新>额外报酬 v. 给……加上边；预付定金，交押金；<古>页边做注释或总结
projection [prəˈdʒekʃ(ə)n] n. 估算，预测；投射，投影；（声音的）发送，放开；（思想感情的）体现，形象化；投射（不自觉地把自己的欲念等加诸他人）；凸出物，隆起物；（地球或天体在平面上的）投射；投影图；规划
