at intervals

Frequent big fires mean that shrublands that would naturally burn at intervals of 30 to 60 years — or even a century or more — are sometimes torched at intervals of a decade or less.

Through 2027, he will return at intervals to the Royal Opera to conduct all four installments of a “Ring” cycle staged by Barrie Kosky.

"At the end of the AHP, we observed at least 14 dry events in the short cores from Chew Bahir, each of which lasted 20-80 years and recurred at intervals of 160±40 years," says Trauth.

At intervals of 90 and 200 days, almost 100% of the petroleum-based microplastics were recovered, meaning none of it had biodegraded.

Countries deliver their donations at intervals throughout the year, and some of the countries were not scheduled to make their payments for several months.