During the war, German tank design went through at least three generations, plus constant minor variations.

For Alice, the hardship of life in the soddy was relieved by the constant variations she saw in the prairie.

But here on the ground, and traveling slowly, there is a constant and subtle variation.

Some sort of rigid hierarchy always emerged as the conservative force in a community, maintaining its identity despite the constant variations and changes that beset it.

Its longitude, however, is subject to constant variation.

The main channel of the river is subject to constant variation and the cultivation in its immediate neighbourhood is, therefore of a shifting kind.

This boundary moves continuously due to the constant variation in solar wind pressure.

Species radiation and selection: constant variations, some good, most bad, but on the whole the good ones survive and propagate.

The only consistency about your performance so far is constant variation.

Mars' orbit is more eccentric than Earth's, exacerbating temperature and solar constant variations.