That is to say, the occurrence might have varied within certain limits without causing our image to vary recognizably.

Bleeding and clotting strokes have similar triggers, the researchers said, leading to questions about why the occurrence would vary with the hour of the day.

The occurrence of one vowel or the other varies from stem to stem in an unpredictable fashion.

The occurrence of Lady chapels varies by location.

In particular, the study found that "occurrence of tungiasis varies throughout the year and seems to follow local precipitation patterns.

Although they are common, their occurrence is unpredictable and varies in location.

The occurrence of astrovirus infection varies depending on the season.

The occurrence, nature and significance of these effects varies among livestock production systems.

A watershed is a spatial area, and the occurrence of water throughout its space varies by time.

Although the occurrence of normal-tension glaucoma varies worldwide, it is very prevalent in Japan.