The problem is nationwide. The main streams of rivers are often given more attention than tributaries and lakes.

这一问题是全国性的。一般来说，河流主要流域比支流和湖泊受到的关注多。

The South was drawn into the main stream of national life.

南方被卷入国民生活的主流。

The BBC faces several challenges, including the possible decriminalization of non-payment of the licence fee, the corporation's main stream of funding.

BBC面临着几项挑战，其电视许可费可能会被合法取消，这是其主要资金来源。

Passing around the north shore of my camp lake I followed the main stream from one lakelet to another.

绕过营地湖的北岸， 我沿着主流从一个小湖流向另一个小湖。

In fact, the ascetics and flagellants of the world belong nowhere in the main stream of civilization — and are of dubious utility and service in any civilization.

事实上，世界上的苦行者和鞭笞者不属于文明的主流——而且在任何文明中都具有可疑的效用和服务。

And when we call to mind that thousands of these rejoicing rills are assembled in each one of the main streams, we wonder the less that our Sierra rivers are songful all the way to the sea.

当我们想起成千上万条欢欣鼓舞的小溪聚集在每条主要溪流中时，我们就不会怀疑我们的塞拉利昂河流一直歌唱到大海。