Tourism is a major source of income for the area.

旅游业是这个地区的主要收入来源。

Fish was a major source of protein for the working man.

鱼曾是劳动者获取蛋白质的主要来源。

The professionalization of politics is a major source of our ills.

政治职业化是导致我们这些弊端的一个主要原因。

The sun is the major source of energy for our planet.

太阳是我们星球能量的主要来源。

In traditional voting, one major source of inaccuracy is that people accidentally vote for the wrong candidate.

在传统的投票中，一个主要的不准确性的来源是人们不小心把票投给了错误的候选人。