Periodic

(adj.) recurring or reappearing from time to time; 'periodic feelings of anxiety' .

(adj.) happening or recurring at regular intervals; 'the periodic appearance of the seventeen-year locust' .

手打:凯勒

• Royalty payments must be paid within 60 days following each date on which you prepare (or are legally required to prepare) your periodic tax returns. 威廉·梅克比斯·萨克雷. 名利场.
• Mendelejeff’s _periodic law_, however, suggests great possibilities in this field. Edward W. Byrn. 十九世纪发明进展.
• If the current could be repeatedly reversed just as the helix completed its half turn, the motion could be prolonged; periodic current reversal would produce continuous rotation. 伯莎M.克拉克. 科学通论.
• Reform tickets make periodic sallies against it, crying economy, efficiency, and a business administration. 沃尔特·李普曼. 政治序论.
• Spain was too far off for periodic reliefs, and the war demanded a more thorough training than was possible with these on and off soldiers. 赫伯特·乔治·威尔斯. 世界史纲.

校对:露辛达