你会懂一些生意模式，但绝不是全部。
坚持了四年原因是生意模式不可持续。
In four years' time, because the business model was not sustainable.
把文字卖给读者，再把读者卖给广告商，这种生意模式一直使报纸得以在社会上发挥作用，但现在这种模式正在逐渐解体。
The business of selling words to readers and selling readers to advertisers, which has sustained their role in society, is falling apart (see article).
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