persistent period造句

Paradoxically, it is not uncommon for the climate to have persistent periods of extreme wetness or dryness in a given area.
However, a persistent period of torrential rain and cold weather then hit west Wales, flooding the marsh area where the nest is located.
A study suggests that people suffering persistent periods of hopelessness may be at greater risk for hypertension, researchers at the University of Michigan report.
Jordan praises Reamer as " one of the most capable human beings I've ever met, " but says UAM hasn't faced a " persistent period " when cash outperforms stocks and bonds.
Ethel was both fertile and fervent, mother to an enormous brood she found difficult to control after becoming a single mother and devout in her Roman Catholicism, which, by all reports, has sustained her through these persistent periods of agony.
It's difficult to find persistent period in a sentence. 用persistent period造句挺难的