The chief source of all this passion is that thought for what is absent and future, which, with man, exercises such a powerful influence upon all he does.

这种激情的主要来源是对所缺少的和未来的思考，这种思考和人一起，对他所做的一切产生了如此强有力的影响。

People regard the sun as the chief source of heat and light.

人们认为太阳是主要的热源和光源。

The chief source of livelihood of lesser dignitaries was petty office and graft.

较小头头的主要生活来源，是占据一个小职位，收点贿赂。

Personal banking is the chief source of profits for commercial banks in the West .

在西方，个人银行业务是商业银行最主要的利润来源。

The chief source of methane is natural gas, but it can also be produced from coal.

甲烷的主要来源是天然气，但也可以用煤来生产。