Heraclitus argued that the three principal elements in nature were fire, earth, and water.

Its principal new element is the copious data from chimpanzees.

Forward planning for this policy is essential and the principal elements are:

In most respects, the principal mechanical elements followed conventional practice.

These three principal elements are most readily associated with this type of music.

In this case a is called the principal element of the ultrafilter.

A principal element in the local economy is agriculture.

A principal element has been to pass on more authority to front-line workers.

The Philippines agreed that the population problem should be considered as the principal element for long-term economic development.

Allow me to draw your attention to the three principal elements of the proposal.