English example sentences with "periodically"

Everyone should periodically receive a physical examination.
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Many birds return to this site periodically.
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Rabies is probably introduced periodically by polar foxes on drift ice from Siberia.
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Your software needs to be updated periodically.
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Like a snake, you periodically shed your skin.
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The mid-ocean ridge consists of thousands of individual volcanoes or volcanic ridge segments which periodically erupt.
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Till now, the total number of my sentences has been periodically decreasing by one to five at a time. That's not funny!
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Sometimes in the course of our adventure we came upon worlds inhabited by intelligent beings, whose developed personality was an expression not of the single individual organism but of a group of organisms. In most cases this state of affairs had arisen through the necessity of combining intelligence with lightness of the individual body. A large planet, rather close to its sun, or swayed by a very large satellite, would be swept by great ocean tides. Vast areas of its surface would be periodically submerged and exposed. In such a world flight was very desirable, but owing to the strength of gravitation only a small creature, a relatively small mass of molecules, could fly. A brain large enough for complex "human" activity could not have been lifted. In such worlds the organic basis of intelligence was often a swarm of avian creatures no bigger than sparrows. A host of individual bodies were possessed together by a single individual mind of human rank. The body of this mind was multiple, but the mind itself was almost as firmly knit as the mind of a man. As flocks of dunlin or redshank stream and wheel and soar and quiver over our estuaries, so above the great tide-flooded cultivated regions of these worlds the animated clouds of avians maneuvered, each cloud a single center of consciousness.
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All machines need to be checked periodically.
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Gabriel has been checking the ship periodically.
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Clean the VCR's head periodically for optimal playback quality.
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Empty the ice and water dispensers periodically to prevent mold or bacteria growth in the fridge.
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Empty the ice and water dispensers periodically to prevent mold or bacteria growth in the refrigerator.
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Women in the study periodically answer questionnaires about their health and lifestyle.
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The life of a young deer can be a tough one. Born barely able to walk, these young deer cannot keep up with their mothers, and they must spend their first weeks of life mostly alone. Fawns will hide from predators throughout the day as the does forage for food to sustain themselves and their babies. The mothers will periodically visit the fawns to nurse, but they also try to keep their young hidden from hunting coyotes and bobcats. Studies of JSC’s deer population show that increased rainfall in the winter and spring results in higher numbers of fawn the following year. In wet years, higher rates of twins, and higher survival rates due to better nutrition, give the deer population the boost it needs to recover from dry years.

Halley's Comet is the best known because it can be seen with the naked eye as it passes by periodically. It was first noticed more than 2,000 years ago. Astronomers have observed and documented its appearances, which has helped them understand comets in general. The comet was named after 17th-century British astronomer Edmond Halley, who computed the rate of its movement from his 1682 observations and predicted that it would reappear in 1758, long after his death.