The main source of revenue is tax.

财政收入的主要来源是税收。

It would give them a steady source of revenue.

这将为他们提供一个稳定的收入来源。

For qualifying blogs, this is an alternate source of revenue.

对于高质量的博客，这是一个替代的收入来源。

Money from ads is the main source of revenue for the company.

通过广告赚的钱是该公司的主要收入来源。

It sees online advertising as an unreliable source of revenue.

它把在线广告视为不可靠的收益来源。