Explain the concept of "stream of income" and its relevance to the way businesses should treat customers. 解释“收入流”的概念，以及它与企业对待消费者的方式之间有何相关。
Marxian impartial allotment thought erection is a revolutionary reform to the old impartial allotment concept of the human society, and is a great leap in the history of income allotment thoughts. 摘要马克思主义公平分配观的建立是对人类社会旧有的公平分配观念的革命性变革，是收入分配思想史上的一次伟大飞跃。
Who originated the concept of stereo sound? 立体声是谁发明的？
The two major concepts of income that appear on the tax return are: adjusted gross income and taxable income. 出现在纳税申报单上的两大收益好象是:调整过的总收入和应纳税收入.