время от времени

. от времени до времени

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Today we see weather balloons on occasion, but passenger balloons are very rare.

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Every now and then, the blade may strike a bump, breaking loose fragments of ...

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The computer itself blunders (every) now and then.

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For 600,000 years rhyolitic lava erupted on the Yellowstone Plateau intermittently.

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At times (or From time to time),basin water is shock treated.

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Evaporate to dryness, turning the granules occasionally to insure uniform coverage.

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Время от времени -- from time to time; now and again, now and then; occasionally; at one time or another; here and there (здесь и там)

 The recorder has several places where mechanical adjustments should be made from time to time, as enumerated below.

 Radiation-annealed hardening has been observed occasionally in neutron-irradiated pressure vessel steels.

 The development of his engines over the years required the use of all of these substances at one time or another.

 We mean the rare successes that surface here and there.

 Check oil level now and then between oil changes.