periodically

The streets are periodically scavenged.

Sea mammals must emerge periodically to breathe.

The results show that the impeller flows periodically under large negative prewhirl angle.

In eastern China, transgression occured periodically during Eogene, and formed specially paleobio-cenosis,mineral association and rock type.

The time-varying and incommutable character of the coefficient matrix of periodically time-varying linear systems are the bottleneck of the design for high precision direct integration methods.

As part of the program, Lown Scholars may also return to Harvard periodically for short-term stays of one week to several months to continue collaborations.

Halosere A plant community in a succession that starts on land periodically inundated by the sea. Haloseres include salt-and flooding-tolerant pioneer communities on mudflats and saltmarshes.