headings

article headings will be set in Times fourteen point.

时报文章用14点字体排印。

we shall use three headings to give some structure to the discussion.

为使讨论有条理，我们列三个。

There are 37 lectures, major headings are geochronology, radiogenic isotope geochemistry and stable isotope geochemistry.

这里有37讲，主要是质代学、放射性同位素球化学和稳定同位素球化学。

These factors can be conveniently categorized under three headings.

这些因素可以很方成3类。