primary source

基本解释

A little more than half of those companies are run by workers with another primary source of income.
这其中，略微超过半数的公司，都是由有另一主要收入来源的人来开办的。
Academic journals tend to be the primary source of news for science reporters because that is where researchers usually publish their findings.
学术杂志通常是科学记者的主要新闻来源，因为科学家通常是在这些杂志上发表他们的发现。
Between budget cutbacks, layoffs and reductions in benefits or increases in hours, clearly our paychecks are not our primary source of satisfaction.
削减预算，减少利益或者被迫增加工作时间，很明显，我们的收入并不是让我们满意的主要源泉。

That's not the only place but that's a primary source of it.
这不是唯一的出处,但是最主要的来源
耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选
You see the lactose of course from milk, and then when you get down to the cellulose, and we're talking about starches and then fiber gets involved in here too, then cereals and vegetables become the primary source of these.
你们知道乳糖来自于乳类,当你研究纤维素的时候,以及我们在这里所说的淀粉和纤维,他们最主要的来源是谷类和蔬菜
耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This is probably your primary source of income, so make the most of it.
FORBES: Earning, Spending, And Saving: The Building Blocks Of Personal Finance
The book focused on access to alternative asset classes as the primary source of endowment alpha.
FORBES: John Bogle Didn't Have All The Data