The trouble was not so much that readers stopped buying newspapers.

问题不在于读者停止购买报纸。

The trouble was not so much that readers stopped buying newspapers. It was that companies talked about their products through advertisements on radio instead of buying advertising space in newspapers.

问题并不在于读者停止购买报纸，而是因为各个公司都通过广播广告来谈论产品，而不是在报纸上购买广告版面。