| The radiation source and additional radiation source are periodically actuated. | ДИИ и ИИ задействуют периодически. |
| His sherpa companions lost sight of him periodically. | Его товарищи-шерпы периодически видели Марко. |
| Water was supplied periodically by a tanker truck. | Вода подвозилась периодически на автоцистернах. |